Christopher Juckins

10_linux_apps_you_should_have

Anonymous (anonymous@undisclosed.example.com) — 2025-01-14T12:16:40+00:00

10 Linux Apps You Should Have Check out these, specifically: * Bitwarden * Timeshift * Stacer

adding_a_second_hard_drive

Anonymous (anonymous@undisclosed.example.com) — 2023-12-31T21:46:50+00:00

Adding a Second Hard Drive to Linux Machine 31 December 2023 - 4TB SSD Hard Drive on NUC 13 Pro Kit running Rocky Linux 9.3 * Install gparted RPM * Start up gparted as root * Select the /dev/sda disk using the pull-down menu in the upper right corner

aide_for_linux

Anonymous (anonymous@undisclosed.example.com) — 2025-12-01T15:20:53+00:00

AIDE for Linux

allowing_passive_ftp_connections

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:13:35+00:00

Accepting passive FTP connections Edit /etc/sysconfig/iptables-config to include: IPTABLES_MODULES=”ip_conntrack” IPTABLES_MODULES=”ip_conntrack_ftp” Then restart vsftp service: service vsftpd restart

android_on_virtualbox

Anonymous (anonymous@undisclosed.example.com) — 2016-04-10T21:49:04+00:00

VirtualBox running Android Notes For Android 4.3 on Virtual Box 4.3.6, System > Acceleration > Uncheck Enable VT-x/AMD-V otherwise you'll get kernel panics. Easiest process is to install Virtual Box first, start it up, th…

appdata_profiles

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:42:12+00:00

AppData / Profiles Mozilla Thunderbird / Firefox profile data needs to go into: C:\Users\\AppData\Roaming Also see:

asus_laptop

Anonymous (anonymous@undisclosed.example.com) — 2015-11-07T01:03:02+00:00

ASUS UL30V Notes Access the Recovery Partition

awk_examples

Anonymous (anonymous@undisclosed.example.com) — 2019-06-28T13:45:53+00:00

awk examples cat files_changed_within_72hrs.sort.txt | awk -F " " '{print $NF}'cat files_changed_within_72hrs.sort.txt | awk -F " " '{print $3,$5}' Turn something like FreeWind_SFC not in ONA_GRID__GFS_20190627_1800 into FreeWind_SFC ONA_GRID__GFS

backups_with_synctoy_2.1

Anonymous (anonymous@undisclosed.example.com) — 2019-03-22T13:34:56+00:00

Backups with Microsoft SyncToy

backup_script_using_xcopy

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:42:46+00:00

Backup Script with XCopy Put the following text in a file and name it xcopyScript.bat Example 1: xcopy "C:\Users\" "D:\backups\" /r /e /h /k /c /y Example 2: REM backup_Users_cjuckins.bat REM 25 Feb 2010 rmdir /s /q "D:\backup_Users_cjuckins\" mkdir "D:\backup_Users_cjuckins\" xcopy "C:\Users\cjuckins\*.*" "D:\backup_Users_cjuckins\" /r /e /h /k /c /y > "D:\backup_Users_cjuckins.log"

bash_tips

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:14:29+00:00

Bash Tips Tips for using .bashrc vs .bash_profile .bashrc root updates (Rocky Linux 9 version): # Added by CJ # Set prompt PS1="[\u@\h: \w]# " PATH=$PATH:$HOME/bin:. export PATH unset USERNAME alias ssh='ssh -Y' alias vi='vim' alias space='df -hP |grep -v tmpfs|grep -v efivarfs' alias kernels='rpm -qa |grep kernel | sort' # no funny characters in man pages #export LC_ALL="en_US" # Use 24-hour clock with 'date' command export LC_TIME="en_GB.UTF-8" # Combine history export HISTSIZE=1000…

better_legacy_linux_commands

Anonymous (anonymous@undisclosed.example.com) — 2025-07-28T13:21:45+00:00

Better (Legacy) Linux Commands * httpie * bat * ncdu * htop * fd (fd-find) * rg (ripgrep)

bootable_usb_drive_from_.iso_file_in_linux

Anonymous (anonymous@undisclosed.example.com) — 2019-04-13T22:56:22+00:00

Bootable USB Drive from .iso file in Linux * Change to directory with .iso file you want to burn to bootable USB drive. * Insert USB drive into Linux machine, it should mount if the drive is formatted as FAT32 (it will not recognize NTFS) * Perform the following commands

brightcove_video_downloads

Anonymous (anonymous@undisclosed.example.com) — 2015-11-14T01:37:56+00:00

Brightcove Video Downloads In Firefox, go to page that has the video Right-click > View Page Info, click Media tab Look for an address the contains brightcove, such as: * Copy…

c-shell_and_other_linux_custom_prompts

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:22:49+00:00

Custom Prompts Good resource for linux prompts Making a .csh prompt look more similar to a .bash prompt: set prompt = "[`whoami`@%m: %~]> "

cac_authentication

Anonymous (anonymous@undisclosed.example.com) — 2015-10-15T13:57:14+00:00

Configuring CAC Authentication Updated 25 September 2013 Tested hardware: Advanced Card Systems Ltd Model ACR38 P/N ACR38U-I1 S/N RR100-182985 Tested software: CentOS release 6.4 (Final) Linux baystate 2.6.32-358.18.1.el6.i686 #1 SMP Wed Aug 28 14:27:42 UTC 2013 i686 i686 i386 GNU/Linux

canon_lide_70_scanner_in_linux

Anonymous (anonymous@undisclosed.example.com) — 2016-10-17T19:24:12+00:00

Canon LiDE 70 in Linux

car_pool_page

Anonymous (anonymous@undisclosed.example.com) — 2009-10-07T22:38:21+00:00

Car Pool Rotation Date Chris Ethan Hugh Approx cost/gallon Tue Apr 22 X $3.65 Wed Apr 23 X $3.70 Thu Apr 24

centos_6_migration_notes

Anonymous (anonymous@undisclosed.example.com) — 2016-04-10T21:46:21+00:00

CentOS 6 Migration Notes RedHat Guides: Fedora Guides: ---------- Jan 2016 Disable kdump by removing kdump and kexec-tools RPMs. ---------- Dec 2015 Set up VSFTPD * *

centos_7_migration_notes

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:58:14+00:00

CentOS 7 Migration Notes RHEL5/6/7 Cheatsheet: Tuxcare's CentOS 7 Extended Support 14 Dec 2023 (for Dell XPS 8930 tower): * Updated kernel from kernel-3.10.0-1160.102.1.el7.x86_64 to kernel-3.10.0-1160.105.1.el7.x86_64 * Attempted to rebooted machine but after the BIOS splash screen, only got a blank screen with blinking cursor in upper-left corner

centos_8_migration_notes

Anonymous (anonymous@undisclosed.example.com) — 2022-06-08T20:03:36+00:00

CentOS 8 Migration Notes When ssh'ing into a CentOS 8 machine via ssh and xterm, slow logouts usually occur. The fix is to not include ssh -X or ssh -Y. Consult Virtual Box running CentOS8 Stream notes if dnf updates are slow Fix php for phpmyadmin: dnf install php-gd php-ldap php-mysqlnd php-pecl-mcrypt php-pecl-zip

centos_php5.6_upgrade

Anonymous (anonymous@undisclosed.example.com) — 2018-11-02T01:38:54+00:00

PHP 5.6 on CentOS 7 Note: mysql_* functions are getting old and they need to be migrated to PDO. See tutorial These were the base packages installed with PHP 5.4 (before upgrading): # rpm -qa |grep php | sort php-5.4.16-36.3.el7_2.x86_64 php-cli-5.4.16-36.3.el7_2.x86_64 php-common-5.4.16-36.3.el7_2.x86_64 php-mbstring-5.4.16-36.3.el7_2.x86_64 php-mcrypt-5.4.16-5.el7.x86_64 php-mysql-5.4.16-36.3.el7_2.x86_64 php-pdo…

centos_php7.2_upgrade

Anonymous (anonymous@undisclosed.example.com) — 2018-11-05T21:28:38+00:00

CentOS 7 PHP 7.2 upgrade Installed packages from php56: php56u-5.6.38-1.ius.centos7.x86_64 php56u-bcmath-5.6.38-1.ius.centos7.x86_64 php56u-cli-5.6.38-1.ius.centos7.x86_64 php56u-common-5.6.38-1.ius.centos7.x86_64 php56u-devel-5.6.38-1.ius.centos7.x86_64 php56u-gd-5.6.38-1.ius.centos7.x86_64 php56u-intl-5.6.38-1.ius.centos7.x86_64 php56u-mbstring-5.6.38-1.ius.centos7.x86_64 php56u-mcrypt-5.6.38-1.ius.centos7.x86_64 php56u-mysqlnd-5.6.38-1.ius.centos7.x86_64 php56u-opcache-5.6.38-1.ius.centos7…

centos_php7.4_upgrade

Anonymous (anonymous@undisclosed.example.com) — 2022-12-20T22:53:53+00:00

PHP 7.4 Upgrade for CentOS CentOS 8 Then install these packages: dnf install php-gd php-ldap php-mysqlnd php-pecl-mcrypt php-pecl-zip Then remove these packages: dnf remove php-fpm CentOS 7 Use this link but substitute in 7.4 for the desired release to activate.

centos_php8.1_upgrade

Anonymous (anonymous@undisclosed.example.com) — 2022-06-06T17:47:18+00:00

Rocky Linux PHP 8.1 Upgrade Pre-existing PHP 7.4 RPMs: [root@tidewater: ~]# rpm -qa |grep php | sort oniguruma5php-6.9.7.1-1.el7.remi.x86_64 php-7.4.28-1.el7.remi.x86_64 php-cli-7.4.28-1.el7.remi.x86_64 php-common-7.4.28-1.el7.remi.x86_64 php-json-7.4.28-1.el7.remi.x86_64 php-mbstring-7.4.28-1.el7.remi.x86_64 php-mysqlnd-7.4.28-1.el7.remi.x86_64 php-pdo-7.4.28-1.el7.remi.x86_64 php-pecl-mcrypt-1.0.4-1.el7.remi.7.4.x86_64 php-sodium-7.4.28-1.el7.remi.x86_64 php-xml-7.4.28-1.el7.remi.x86_64

checking_network_speed

Anonymous (anonymous@undisclosed.example.com) — 2017-05-13T13:35:51+00:00

Checking Linux Network Interfaces To check status of network interfaces, run this tool. It should be able to give information for non-root users, too. # ethtool Example: [root@localhost: ~]# ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supports auto-negotiation: Yes …

clamav_antivirus

Anonymous (anonymous@undisclosed.example.com) — 2023-07-03T14:29:21+00:00

ClamAV AntiVirus Notes ClamAV on RockyLinux 9 - Basic install instructions ClamAV on Rocky Linux CentOS 7 VM notes: Set /etc/clamd.d/scan.conf "MaxThreads" to 1 (default is 10) to avoid too much CPU usage upon reboot CentOS 7 issues: If not CentOS7, start with this procedure - or see steps listed below:

clean_up_html_markup_with_tidy_and_perl

Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:11:33+00:00

HTML Tidy Download and install Tidy. For help, do: tidy -help To clean up HTML by creating indented code, wrapping text at column #500, converting HTML to XHTML, and modify the existing file in place, do the following: tidy -i -w 500 -asxml -m

combine_merge_pdf_files

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:21:40+00:00

Combine/Merge PDF Files Merge PDF files $ gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=merged_file.pdf -dBATCH pdf_1.pdf pdf_2.pdf$ gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=OUTFILE.pdf file1.pdf file2.pdf

cron_tips

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:21:56+00:00

Linux Cron Tips Cron Trigger formats Using dynamic log filenames 56 * * * * script.pl >$HOME/log/script.cron.$(date +\%Y\%m\%d).log 2>&1

crystal_reports

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:43:28+00:00

Crystal Reports Connecting to a MySQL database Download the Connector/J code from MySQL (unzip and save .jar file): Follow the instructions on this page: Crystal Reports Tutorial:

dell_bios_updates_when_running_linux

Anonymous (anonymous@undisclosed.example.com) — 2020-01-07T15:59:18+00:00

Dell BIOS Updates when running Linux Dell BIOS Updates in Linux Environment

disable_screen_blanking

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:23:33+00:00

Disable Screen Blanking in Linux By default, Red Hat Linux blanks the screen after an interval of no keyboard or mouse activity (usually 10 minutes). This can be sometimes inconvenient. To disable screen blanking: * Login to the machine as root

disable_terminal_bells

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:25:02+00:00

Disable bells and beeps in terminal windows For example, when you get annoying beeps when using vi on Red Hat linux: xset -b Edit /etc/inputrc and add this line: set bell-style none If you are using GNOME, you can do the following: Choose Preferences-

disk_space_usage

Anonymous (anonymous@undisclosed.example.com) — 2016-04-12T00:38:50+00:00

Disk Space Usage To really find out how much space your Windows computer is using, use WindDirStat

distorted_ie_images_dell_laptop_1920x1200

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:25:24+00:00

Distorted IE images / Dell laptops 1920x1200 Close all IE windows. Start->Run->regedit Drill down to HKEY_Current_User/Software/Microsoft/Internet Explorer/Main In panel on right hand side, right-click UseHR, Select Modify, Change Value from (Hex) 1 to (Hex) 0

djvu_files

Anonymous (anonymous@undisclosed.example.com) — 2017-11-27T19:38:31+00:00

DjVu Files * They are viewable with evince or Atril Document Viewer To manipulate .djvu files: * yum install djvulibre Delete a page: * djvm -d file.djvu n (where 'n' is a sample page number) Convert from .djvu to .pdf: * ddjvu -format=pdf -quality=85 -verbose file.djvu file.pdf

dnf_installer_bash_script_fedora_40

Anonymous (anonymous@undisclosed.example.com) — 2024-07-25T19:21:29+00:00

dnf installer bash script (Fedora 40) When you run the code below, ensure to redirect output and errors to a log file. If this is a new install, consider the SELinux settings. ---------- #!/bin/bash # # install-my-dnf-packages-fc40.bash # Fedora 40 version # # NOTES: # Installed groups can be found with: # dnf group list # # Contents of groups can be found with: # dnf group info "Group Name" # # TO RUN: # ./install-my-dnf-packages-fc40.bash > /tmp/install-my-dnf-packages-fc40.log 2>&1…

dnf_installer_bash_script_fedora_41

Anonymous (anonymous@undisclosed.example.com) — 2025-03-22T13:22:55+00:00

dnf installer bash script (Fedora 41) When you run the code below, ensure to redirect output and errors to a log file. If this is a new install, consider the SELinux settings. ---------- #!/bin/bash # # install-my-dnf-packages-fc41.bash # Fedora 41 version # # NOTES: # Installed/Available groups can be found with: # dnf group list # # Contents of groups can be found with: # ?? # # TO RUN: # ./install-my-dnf-packages-fc41.bash > /tmp/install-my-dnf-packages-fc41.log 2>&1 # echo "" ech…

dnf_installer_bash_script_fedora_43

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T23:25:25+00:00

dnf installer bash script (Fedora 43) When you run the code below, ensure to redirect output and errors to a log file. If this is a new install, consider the SELinux settings. ---------- #!/bin/bash # # install-my-dnf-packages-fc43.bash # Fedora 43 version # # NOTES: # Installed/Available groups can be found with: # dnf group list # # Contents of groups can be found with: # ?? # # TO RUN: # ./install-my-dnf-packages-fc43.bash > /tmp/install-my-dnf-packages-fc43.log 2>&1 # echo "" ech…

dnf_installer_bash_script_rocky_linux_9

Anonymous (anonymous@undisclosed.example.com) — 2026-03-02T12:53:48+00:00

dnf installer bash script (Rocky Linux 9) When you run the code below, ensure to redirect output and errors to a log file. If this is a new install, consider the SELinux settings. This may not be needed, but if slow downloading of packages occurs, modify /etc/dnf/dnf.conf to

dnf_installer_bash_script_rocky_linux_10

Anonymous (anonymous@undisclosed.example.com) — 2025-12-01T15:18:00+00:00

dnf installer bash script (Rocky Linux 10) When you run the code below, ensure to redirect output and errors to a log file. If this is a new install, consider the SELinux settings. Errors with the script: * Check: RPM Perl-Array-Diff not available

dns_performance_check

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:53:18+00:00

DNS Performance Check

dokuwiki_reference_links

Anonymous (anonymous@undisclosed.example.com) — 2025-10-20T23:45:25+00:00

Dokuwiki Reference Links Main Dokuwiki Page Downloading Dokuwiki Upgrading Dokuwiki Upgrading can also be done very easily via the upgrade plugin, available via the Admin page once you are logged in.

dynamic_dns_and_letsencrypt

Anonymous (anonymous@undisclosed.example.com) — 2021-02-13T18:33:31+00:00

Dynamic DNS and LetsEncrypt

dynamic_dns_ddns_notes

Anonymous (anonymous@undisclosed.example.com) — 2017-11-17T01:55:38+00:00

Dynamic DNS (DDNS) Notes from Ubuntu Wiki ddclient updater

enigmail_setup_and_gnupg_keys

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:29:39+00:00

Enigmail and OpenPGP Keys OpenPGP & Enigmail Quick start guide Install GnuPG on local computer Windows uses version 1.4.11 as of 10 February 2011 - accept default settings Install right Enigmail package for your system. …

etc_passwd_and_etc_shadow_error_messages

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:30:14+00:00

Errors with /etc/password and /etc/shadow Using system-config-users gives an error message due to a problem with /etc/passwd and /etc/shadow. Use the following: pwck grpck

exporting_importing_database_tips

Anonymous (anonymous@undisclosed.example.com) — 2025-12-07T04:10:11+00:00

Database Import-Export Tips Users and permissions: Import-export: Create database, then import sql: create database db_name; mysql -u XXX -p'XXX' database_name < archive.sql ---------- You can also use phpMyAdmin to export databases. On new machine, make sure database does not exist.

fedora_40_migration_notes

Anonymous (anonymous@undisclosed.example.com) — 2024-07-25T19:19:36+00:00

Fedora 40 Migration Notes Installation * Perform a minimal or basic install of Fedora 40 * Backup /etc/selinux/config and change from enforcing to permissive. Reboot. * Run the Fedora 40 bash setup script to get the usual extras, add-ons and other packages * Reboot target computer and login.

fedora_41_migration_notes

Anonymous (anonymous@undisclosed.example.com) — 2024-12-19T20:02:10+00:00

Fedora 41 Migration Notes Installation * Perform a minimal or basic install of Fedora 41 * Backup /etc/selinux/config and change from enforcing to permissive. Reboot. * Run the Fedora 41 bash setup script to get the usual extras, add-ons and other packages * Reboot target computer and login.

fedora_42_migration_notes

Anonymous (anonymous@undisclosed.example.com) — 2025-08-21T09:42:30+00:00

Fedora 42 Migration Notes Installation This time I did an in-place upgrade using steps listed on Specific commands were the following: sudo dnf --refresh upgrade && sudo reboot sudo dnf system-upgrade download --releasever=42 sudo dnf5 offline reboot

fedora_43_migration_notes

Anonymous (anonymous@undisclosed.example.com) — 2026-03-01T23:24:45+00:00

Fedora 43 Migration Notes Look at changing default disk partitions. Give root a password. Set hostname. systemctl enable sshd systemctl restart sshd To make logs like /var/log/maillog show up, do the following: * sudo dnf install rsyslog * systemctl enable

fedora_upgrade_process_with_cleanup_tips

Anonymous (anonymous@undisclosed.example.com) — 2025-11-17T21:42:53+00:00

Fedora Upgrade Process with Cleanup Tips

finding_open_files_or_files_being_accessed

Anonymous (anonymous@undisclosed.example.com) — 2018-08-15T14:18:08+00:00

Finding open files or files being accessed Use lsof Ex: lsof -p 669 2>/dev/null|grep disk2

find_duplicate_files_in_linux

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:32:09+00:00

Find Duplicate Files in Linux From find -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate

find_files

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:33:00+00:00

Find files tips #!/bin/bash find /u1/database/prod/arch -type f -mtime +3 -exec rm {} \; cd /some/dir du -m --max-depth=1 find . -mtime +3 Argument list too long workaround: find -type f -name '*.txt' | wc -l

find_your_public_ip

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:40:10+00:00

Finding your Public IP curl https://ipinfo.io/ip

firefox_about_config_tips

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:53:52+00:00

Firefox About:Config Tips * In Linux, changed dom. disable_window_open_feature.personalbar (others, too) * In Linux, changed browser.urlbar.clickSelectsAll to match Windows behavior (now True) * In Linux, changed browser.urlbar.doubleClickSelectsAll to match Windows behavior (now False)

firefox_already_running_error

Anonymous (anonymous@undisclosed.example.com) — 2017-06-01T17:49:36+00:00

Firefox Already Running Error To fix "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system" do the following: * In $HOME: find ~/.mozilla -name "*lock"

force_https_by_directory

Anonymous (anonymous@undisclosed.example.com) — 2008-08-03T03:29:03+00:00

cd to directory you want to protect. vi .htaccess RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} -or- SSLRequireSSL then: service httpd restart

force_https_ssl_on_a_website

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:38:58+00:00

Force HTTPS/SSL on a website Using .htaccess: cd to directory you want to protect and edit .htaccess such as the following: RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} -or- SSLRequireSSL then:

gcc_update

Anonymous (anonymous@undisclosed.example.com) — 2023-05-10T16:41:22+00:00

GCC Update To update GCC for CentOS 7, follow these instructions (original error was CXXABI 1.3.9 not found on CentOS 7)

gimp_tricks

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:54:26+00:00

GIMP Tips Selecting a region of an image and highlighting a border it (stroke selection): Note: If necessary, crop image first. Save, close GIMP. Re open GIMP, select region to apply stroke. Right click and choose Edit > Stroke Selection. As of GIMP v2.6.9.

git_notes

Anonymous (anonymous@undisclosed.example.com) — 2023-06-05T19:44:04+00:00

Git Notes Git Git - The Simple Guide Git Tutorial Basic Git Commands Enable coloring: git config --global color.ui true

gmail_as_a_relay_on_linux

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:55:13+00:00

Using Gmail as a Relay on RedHat Linux (non 2-factor auth) RockyLinux 9 Notes: * (Nothing special noted) CentOS 8 Notes: * (Nothing special noted) Required packages if CentOS7 7.2.1511: * postfix (tested version 2.10.1-6.el7 ) * ca-certificates.noarch (tested version 2015.2.4-70.0.el7_1)

gmail_as_a_relay_on_linux_centos7

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:55:32+00:00

GMail as a Relay on Linux CENTOS7 (with 2-factor auth) You can remove Postfix and use SSMTP as it has easier configuration. yum install ssmtp ca-certificates mutt Follow instructions at * See [Sending_Emails_From_Your_Linux_Server.pdf] To get desired sender (username@hostname) when using mutt to send, add this line to /etc/ssmtp/ssmtp.conf:

gmail_as_a_relay_on_linux_centos8

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:55:48+00:00

GMail as a Relay on Linux Ubunutu 20.04 LTS and CENTOS8 (with 2-factor auth) Using Postfix for this solution. Follow instructions at Or see the same at [Sending Emails Using Postfix From Your Linux Server] * Will this also break with less sure apps? * The "Less Secure Apps" is not available in Gmail if your account is configured for 2-factor authentication

gmail_encryption

Anonymous (anonymous@undisclosed.example.com) — 2024-03-22T13:39:54+00:00

GMail Encryption and other Tips Encrypt Gmail Extension with Chrome: Mymail-Crypt for Gmail Finding messages without labels (see ) Method 1 - Turn off conversation view in settings. -has:userlabels -in:sent -in:chat -in:draft -in:inbox (from )

gmail_on_linux_with_msmtp

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:56:41+00:00

Sending email via Gmail with MSMTP Kept getting an error: # cd /usr/local/src/msmtp-1.4.27] # make check Making check in src make[1]: Entering directory `/usr/local/src/msmtp-1.4.27/src' CCLD msmtp tls.o: In function `tls_init': /usr/local/src/msmtp-1.4.27/src/tls.c:1100: undefined reference to `gnutls_priority_set_direct' collect2: ld returned 1 exit status make[1]: *** [msmtp] Error 1 make[1]: Leaving directo…

gmail_on_linux_with_ssmtp

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:56:16+00:00

Sending email via Gmail using SSMTP Edit ~/.muttrc for each user as appropriate (not that $HOSTNAME does not seem to be set with cron sending) set sendmail="/usr/sbin/ssmtp" #set from = $USER@$HOSTNAME #set from = username@HOSTNAME_OR_ALIAS.domain set realname="juckins@lightning"

gnuwin32_-_coreutils_install

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:43:52+00:00

GNUWin32 Core Utils Get the code from: To setup the Windows PATH: 1. Open the Control Panel 2. Choose "System and Security" 3. Choose "System" 4. Choose "Advanced System Settings" 5. Choose "Environment Variables" 6. Under "System variables" click "Path"

google_analytics_tips

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:42:35+00:00

Google Analytics Tips Stopping Referral SPAM

google_chrome_devtools_tips

Anonymous (anonymous@undisclosed.example.com) — 2019-09-12T14:00:59+00:00

Google Chrome DevTools Tips To monitor network traffic, identify the webpage you want to inspect, including filling out forms, etc. Push F12 to load Chrome's DevTools console in a new pane on the right side of the browser. Click Network at the top of the pane if it is not already selected.

google_chrome_gpg_keys_troubleshooting

Anonymous (anonymous@undisclosed.example.com) — 2025-06-25T20:37:17+00:00

Google Chrome GPG Keys Troubleshooting If you get the following error when trying to update Google Chrome: GPG key at https://dl.google.com/linux/linux_signing_key.pub (0xD38B4796) is already installed The GPG keys listed for the "google-chrome" repository are already installed but they are not correct for this package. Check that the correct key URLs are configured for this repository.. Failing package is: google-chrome-stable-138.0.7204.49-1.x86_64 GPG Keys are configured as: https://dl.googl…

gparted_-_partition_editor

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:57:09+00:00

GParted partition error

grep_tricks

Anonymous (anonymous@undisclosed.example.com) — 2019-10-03T18:54:41+00:00

grep tricks The below command: grep "G " du.info.20190103a.txt Is produced by typing: grep "G CTRL+V+TAB" du.info.20190103a.txt

gvfsd-metadata_running_for_a_long_time

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:45:19+00:00

gvfsd-metadata Running for a Long Time ps -ef|grep gvfsd-metadata Kill -9 it. Then as user where the process was running: rm -rf ~/.local/share/gvfs-metadata

hard_drive_copy_sector-by-sector

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:45:13+00:00

Hard Drive Copy Sector-by-Sector EASEUS Disk Copy: EASEUS TODO Backup:

high_cpu_usage

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:45:46+00:00

High CPU Usage top iotop

how_to_restart_a_print_queue

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:45:57+00:00

How to Restart a Print Queue ssh -X into the workstation type printtool Highlight the printer Then click on APPLY (green arrows at top) You will also see the jobs in /var/spool/cups if there are alot of jobs in the directory, delete them service cups restart

htaccess_files_allowing_from_ip_address

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:37:58+00:00

Apache .htaccess files and Allowing from IP Address Apache documentation on .htaccess Apache documentation on auth.html to create a new password file: # htpasswd -c /var/www/passwd/passwords rbowen New password: mypassword Re-type new password: mypassword Adding password for user rbowen to append to existing password file:

https_server_configuration

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:47:45+00:00

Setting up HTTPS server modify httpd.conf for port 443 modify iptables for allowing port 443 RHEL5 Instructions RHEL4 Instructions RHEL3 Instructions

http_server_fails_to_start

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:46:35+00:00

httpd server process fails to start If the httpd server process fails to start, check /var/log/httpd/error_log If you see something like this: [Tue Nov 29 11:33:15 2011] [error] SSL Library Error: -8181 Certificate has expired [Tue Nov 29 11:33:15 2011] [error] Unable to verify certificate 'Server-Cert'. Add "NSSEnforceValidCerts off" to nss.conf so the server can start until the problem can be resolved.

imagemagick_notes

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:57:28+00:00

ImageMagick Notes #centers text at bottom montage -label "Faerie Dragon" 201010211800_a.png -geometry +0+0 -background black -fill white 201010211800_a.png # at top, on image, centered convert 201010211800_a.png -fill white -undercolor black -gravity north -annotate +0+0 'Faerie Dragon' 201010211800_a_label.png system ("convert -colors 8 -size 895x49 xc:white -font Helevetica \\ -pointsize 28 -gravity center +dither \\ -fill black \\ -annotate …

installing_phpmyadmin_tips

Anonymous (anonymous@undisclosed.example.com) — 2022-01-24T19:08:17+00:00

Installing phpMyAdmin Tips * Ensure php-mcrypt, libmcrypt, php-mbstring, php-pear-MDB2-Driver-mysqli.noarch are installed and httpd service restarted * Ensure mysql/mariadb installation has been secured * Download, unpack, install from * Create symbolic link to phpmy

install_unifi_on_centos

Anonymous (anonymous@undisclosed.example.com) — 2019-03-20T12:02:57+00:00

Install Unifi controller on CentOS Navigate to Restore from backup.

install_unifi_on_ubuntu

Anonymous (anonymous@undisclosed.example.com) — 2023-01-10T02:17:30+00:00

Install Unifi controller on Ubuntu Follow these easy update instructions to install latest Unifi controller on Ubuntu and run once per month. Make a copy of the VM first (keep NAT settings to force same IP), shut it down, and use the copy VM as a test. 22 May 2022 Updated to version 7.1.65 20 Apr 2022

iso_image_tips

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:18:02+00:00

ISO Image Tips Make a CD from an .iso image Open Nautilus file manager and browse to .iso file. Right-click and choose “Write to disc” – DVD should then be created. Or try the command line: cdrecord -v -pad src.iso ---------- Create an .iso image from a CD

iso_recorder_for_windows

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:45:32+00:00

ISO Recorder for Windows ISO Recorder for Windows From the website: ISO Recorder is a tool (power toy) for Windows XP, 2003 and now Windows Vista, that allows (depending on the Windows version) to burn CD and DVD images (DVD support is only available on Windows Vista), copy disks, make images of the existing data CDs and DVDs and create ISO images from a content of a disk folder.

kde_preferences_in_rhel5_for_better_performance

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:50:42+00:00

KDE Preferences for Better Performance Note these tips were originally written for RHEL5. Turn off animated mouseover effects: In KDE, go to the main Application Launcher button --> Control Center --> Desktop --> Panels (or open "kcontrol" from an xterm)

libreoffice_notes

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:57:45+00:00

LibreOffice Notes It turns out that if the environmental variable $DATA is set (for purposes other than LibreOffice), it fails. If $DATA is unset, the application starts just fine. Bug appears in v3.4.5. Fix scheduled for 3.5 and above.

linux_backups

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:58:00+00:00

Linux Backups Local tar/rsync script: #!/usr/bin/perl -w # backup_rsync.pl # Script using rsync to backup directories to 2nd local hard disk # /boot/ # /etc/ # /home/ # /root/ # /usr/local/ # /var/lib/mysql/ # /var/spool/cron/ # /var/www/html/ $LOG = "/tmp/backup_rsync"; `/usr/bin/rsync -avz --delete --progress /awips/ /disk2/awips/ >$LOG.awips.log 2>&1`; `/usr/bin/rsync -avz --delete --progress /AWIPS/ /disk2/AWIPS/ >$LOG.AWIPS.log 2>&1`; `/usr/bin/rsync -…

linux_password_managers

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:51:23+00:00

Linux Password Managers Article on Linux password managers: Password Gorilla - work on linux but does not support mobile devices KeyPass (Windows only) supports mobile devices

linux_system_rescue_cd

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:51:56+00:00

Linux System Rescue CD

loading_cdrom_software_onto_laptop_lacking_cdrom_drive

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:45:45+00:00

Loading CD software onto laptop w/o a CDROM drive 1. create .iso on linux (Follow Dokuwiki) 2. check sum -r for CDROM and .iso 3. copy .iso over to laptop via SCP 4. Start the MagicDisc program in Windows 5. Right-click MagicDisc task bar icon, choose Virtual CD/DVD-ROM

local_perl_modules

Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:29:27+00:00

Local perl Modules To install a local perl module, follow steps like these: mkdir ~/lib cd ~/lib wget http://search.cpan.org/CPAN/authors/id/R/RK/RKHILL/DateTime-Astro-Sunrise-0.01_01.tar.gz tar -zxvf DateTime-Astro-Sunrise-0.01_01.tar.gz cd DateTime-Astro-Sunrise-0.01_01 perl Makefile.PL PREFIX=~/lib LIB=~/lib make make test make install



In the actual script you want to run, include this:

use lib '/path/to/username/lib';
use DateTime;
use DateTime::Astro::Sunrise;



magiciso
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:46:02+00:00
Magic ISO



(Also called MagicDisc)

From the website:

MagicISO is a powerful CD/DVD image file creating/editing/extracting tool. It can open / create / edit /extract CD/DVD image files.  It can convert bin to iso and back as well as make ISO file from DVD/CD-ROM or hard disk, and handle bootable information at meanwhile.


make_a_free_public_wifi_hotspot
Anonymous (anonymous@undisclosed.example.com) — 2016-04-29T03:31:47+00:00
Make a Free Public WiFi Spot using Windows

My Public WiFi - Turn your computer into a WiFi Access Point


mantis_tips
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:00:06+00:00
Mantis Tips

Create mantis database. 

Create mantis user. 

Create mantis user password. 

Grant all privileges on mantis database for mantis user.


man_pages_and_funny_characters
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:52:43+00:00
Funny characters on man page

As root, edit /etc/sysconfig/i18n 



LANG="en_US" <--- remove the ".UTF-8" default
SUPPORTED="en_US.UTF-8:en_US:en"
SYSFONT="latarcyrheb-sun16"


Or do this:


export LC_ALL="en_US"


mate_desktop_notes
Anonymous (anonymous@undisclosed.example.com) — 2021-11-26T01:23:40+00:00
MATE Desktop Notes

If Desktop icons fail to load properly:

	*  Ensure caja is installed
	*  Check that ~/.config/user-dirs.dirs does not have just "$HOME/" for the Desktop icons
	*  See notes at 

For CentOS Stream 8 see 


memory_testing
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:53:04+00:00
Testing Memory for Errors

Install memtester-4.2.1-1.el6.x86_64 and memtest86+-4.10-2.el6.x86_64 (or updated versions).


# memtest-setup
# memtester 500M
# memtester 10G 2


Check output.

Also look at the 'sar' program.  Files in /var/log/sa.

Example run:


memory_usage
Anonymous (anonymous@undisclosed.example.com) — 2019-11-18T21:31:18+00:00
Monitoring memory usage
cat /proc/meminfo
vmstat -s


microsoft_excel_tips
Anonymous (anonymous@undisclosed.example.com) — 2020-04-12T12:44:57+00:00
Microsoft Excel Tips

Preserve Grid Lines with filled cells


mirroring_with_lftp
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:59:11+00:00
Using lftp to Mirror a Website

To mirror a website and do some sophisticated FTP commands, check out lftp 

To mirror a directory, cd to local directory first and then do the following:


$ lftp username@server.domain
lftt> cd 
lftp> mirror -R -e -v -n (use --dry-run to just list files)


mirror_websites_with_wget
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:59:27+00:00
Using wget to Mirror a Website



--

The quickest and easiest way to mirror a remote Web site is to use wget. Wget is similar to cURL (and I'll be the first to admit that I prefer cURL over wget), but wget has some really slick and useful features that aren't found in cURL, such as a means to download an entire Web site for local viewing:


monitoring_network_performance
Anonymous (anonymous@undisclosed.example.com) — 2023-01-18T14:57:53+00:00
Monitoring Network Performance

Grafana to display statistics

Prometheus to gather data


mount_a_usb_flash_drive
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:53:42+00:00
Mount a USB Flash Drive





Mounting a USB flash drive in GNOME (or another Linux desktop environment) is as easy as plug and play. Yet, occasionally, you need to mount one on a server which does not run X, then you must know how to do it on the command line.


    Become root.

    $ sudo -s



    Plug in USB drive to a USB port.

    Identify the correct partition name corresponding to the USB drive.

    For m…


mount_cdrom
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:54:20+00:00
Mount a CDROM

As root:


mount /dev/cdrom /mnt


ms_word_2007_default_spacing
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:46:28+00:00
Microsoft Word Default Spacing

To change the default spacing and template in Word 2007:




multihome_network_connection
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:54:41+00:00
Multihome Network Connection

Put the following entry into /etc/rc.d/rc.local


# setup multihomed IP
/sbin/ifconfig eth0:0 XXX.XXX.XXX.XXX netmask 255.255.255.0 up


To effect the change immediately, run the command as root and service network restart.


mutt_tips
Anonymous (anonymous@undisclosed.example.com) — 2020-03-30T20:12:25+00:00
Mutt Tips

To send an email in HTML format, here is a piece of perl code:
$html_format = "set content_type=text/html";
$return_code_mutt = system("/usr/bin/mutt -e \"$html_format\" -s \"SUBJECT\" -- user\@domain.com 

mysql_time_date_tips
Anonymous (anonymous@undisclosed.example.com) — 2024-11-28T02:38:55+00:00
MySQL Tips

SELECT and JOIN



Time/date











Performance

Max connections

Checking for errors in…


nagios_config_commands
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:59:50+00:00
Nagios Configuration Commands

Editing Nagios Main Config, and adding new hosts: 

/usr/local/nagios/etc/nagios.cfg

Editing Nagios Host Configurations: 

/usr/local/nagios/etc/objects

Checking for Config Errors: 

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg


nice_windows_fonts_on_linux
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:57:21+00:00
Nice Windows fonts in Linux

Use "webcore" fonts RPMs. 


Webcore Fonts

You can also copy font files into a user's .fonts directory, then run fc-cache ~/.fonts/

Example such as "Latin Modern" at  which is similar to the LaTeX font.  

See 


nomachine_nx_remote_access_for_unix_linux
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:00:29+00:00
NoMachine v3 Notes



There is a known limit to the number of users for the free version of NX:


NoMachine version is limited to two 'named' users. To check or change these,
nxserver --userlist, nxserver --useradd, nxserver --userdel. These will have
been the first two users to connect.

Cheers
Euan

On 10/16/06, Maccy  wrote:
> Hi,
>
> I'm experiencing a very strange problem whereby newly created users are
> not able to connect to a machine via …


nomachine_nx_remote_access_for_unix_linux_v4
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:00:47+00:00
NoMachine v4 Notes

Installation instructions 



Compatibility between v3 and v4 



Note: NX client v3 cannot connect to NX server v4 via SSH; only via NX.  SSH connections are only supported with a paid server v4 version.

Setting up a Linux to Linux connection


nomachine_remote_access_for_unix_linux
Anonymous (anonymous@undisclosed.example.com) — 2010-10-17T20:20:27+00:00



nss_tips
Anonymous (anonymous@undisclosed.example.com) — 2018-07-23T13:08:43+00:00
NSS (Name Service Switch) Tips

Find user info based on UID:


getent passwd NNNN (where NNN is the userid)


ntp_tips
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:57:41+00:00
NTP Tips

Ed Halley's Configuring NTP Daemon: 



Configure NTP Server in Linux: 



Configure /etc/ntp/step-tickers if you notice clock drifting


nvidia_settings
Anonymous (anonymous@undisclosed.example.com) — 2022-10-25T23:58:29+00:00
NVIDIA Drivers and Settings

Install NVIDIA drivers on CentOS 7

Install NVIDIA drivers on CentOS 7 (alt)

	*  For "tidewater", the graphics card is GP107 [GeForce GTX 1050 Ti]
	*  To find it on  drill down to:
		*  GeForce > GeForce 10 Series > GeForce GTX 1050 Ti > Linux 64-bit > Production

	*  You can also find the latest production version on


orphanswanted
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T13:11:25+00:00



percona_toolkit
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:01:27+00:00
Percona Toolkit

Percona Toolkit is a collection of advanced command-line tools used by Percona () support staff to perform a variety of MySQL and system tasks that are too difficult or complex to perform manually.

These tools are ideal alternatives to private or “one-off” scripts because they are professionally developed, formally tested, and fully documented. They are also fully self-contained, so installation is quick and easy and no libraries are installed.


perl_best_practices
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:27:50+00:00
Perl Best Practices




perl_install_configure_cpan
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:33:06+00:00
CPAN (Perl) Repository Tips

It seems the "cpanm" command is the best option to manage installing/removing needed perl modules if they are not available in an RPM format for the operating system (EPEL, etc).
dnf install perl-App-cpanminus

As root, to install:


perl_manipulating_date_strings
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:30:00+00:00
Perl Manipulating Date Strings

Print file modification times:


$filename = "201010211800_a.png";
$mtime = (stat $filename)[9];
chomp($mtime);
$mtime_date = `/bin/date --date='Jan 1, 1970 00:00:00 +0000 + $mtime seconds' '+%A, %d %B %Y %H:%M:%S %Z'`;

Output is: Thursday, 21 October 2010 22:21:49 UTC


perl_print_immediately_by_flushing_buffer
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:31:15+00:00
Perl Print Immediately to Screen

To print output to log files or screen immediately, flush the buffer:

$|=1;




perl_reading_entire_file_into_a_string
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:32:02+00:00
Perl Reading an entire file into a string

Option 1:


Use File::Slurp
$file_contents = read_file($wget_saved_filename);


Option 2:


open (READ_WGET_FILE, "<$data_dir/$wget_saved_filename");
$file_contents = do { local $/;  };
close (READ_WGET_FILE);


perl_remove_newlines
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:33:23+00:00
Perl Remove Newlines



perl -p -i -e 's/\R//g;' filename


perl_replace_string_inline
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:33:32+00:00
Inline string replacement with Perl


perl -p -i -e 's/5005P/500P /g' /path/to/files/filename_date_2015*.txt

perl -p -i -e 'BEGIN{undef $/;} s/.*//smg' history_file.txt


perl_sending_email
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:33:41+00:00
Sending email with Perl


#!/usr/bin/perl -w

$sysadmin = "user\@domain.com";
$script_name = "test";
$archive_data_dir = "/a/b/c"; 
$latest_file_download = `ls -1 $archive_data_dir| tail -n 1`;

now();
`echo '$now\n\nLast saved file: $latest_file_download' | mailx -s '$script_name.pl reports stale source files' $sysadmin`;

sub now {
  $now = `date`;
  chomp($now);
}


php8.1_upgrade
Anonymous (anonymous@undisclosed.example.com) — 2022-09-29T18:51:00+00:00
Rocky Linux 9 PHP 8.1 Upgrade

Follow procedure at 
dnf config-manager --set-enabled crb
dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm 
dnf install https://dl.fedoraproject.org/pub/epel/epel-next-release-latest-9.noarch.rpm
dnf install dnf-utils http://rpms.remirepo.net/enterprise/remi-release-9.rpm
dnf remove php php-fpm
dnf remove php*
dnf module list reset php
dnf module list php
dnf mo…


php8.2_on_centos_7
Anonymous (anonymous@undisclosed.example.com) — 2022-12-20T22:56:19+00:00
PHP 8.2 on CentOS 7


yum-config-manager --enable remi-php82
yum update php\*
After the install, these PHP packages should be on the system:
php-8.2.0-1.el7.remi.x86_64
php-cli-8.2.0-1.el7.remi.x86_64
php-common-8.2.0-1.el7.remi.x86_64
php-mbstring-8.2.0-1.el7.remi.x86_64
php-mysqlnd-8.2.0-1.el7.remi.x86_64
php-pdo-8.2.0-1.el7.remi.x86_64
php-pecl-mcrypt-1.0.5-1.el7.remi.8.2.x86_64
php-sodium-8.2.0-1.el7.remi.x86_64
php-xml…


php8.2_on_rocky_linux_8
Anonymous (anonymous@undisclosed.example.com) — 2024-01-17T22:28:10+00:00
PHP 8.2 on Rocky Linux 9

Follow notes at Remi's RPM Repo Blog and linuxcapable.com
dnf config-manager --set-enabled crb
dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm 
NOTE: You may not want the following: dnf install https://dl.fedoraproject.org/pub/epel/epel-next-release-latest-9.noarch.rpm
dnf install dnf-utils http://rpms.remirepo.net/enterprise/remi-release-9.rpm
dnf module reset php
dnf module list php
dnf module enable php:remi-8.2
dnf install php php-…


php8.3_on_rocky_linux_9
Anonymous (anonymous@undisclosed.example.com) — 2024-01-17T22:44:11+00:00
PHP 8.3 on Rocky Linux 9

Follow notes at linuxcapable.com
dnf config-manager --set-enabled crb
dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm 
NOTE: You may not want the following: dnf install https://dl.fedoraproject.org/pub/epel/epel-next-release-latest-9.noarch.rpm
dnf install dnf-utils http://rpms.remirepo.net/enterprise/remi-release-9.rpm
dnf module list php
dnf module reset php
dnf module enable php:remi-8.3
dnf install php php-cli php-mysqlnd php-opcac…


php8.4_on_rocky_linux_9
Anonymous (anonymous@undisclosed.example.com) — 2025-09-29T20:25:25+00:00
PHP 8.4 on Rocky Linux 9

Follow notes at Remi's RPM repository - Blog
dnf config-manager --set-enabled crb
dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm 
dnf install http://rpms.remirepo.net/enterprise/remi-release-9.rpm
dnf install dnf-utils
dnf module list php
dnf module reset php
dnf module enable php:remi-8.4
dnf install php php-cli php-mysqlnd php-opcache php-pdo php-pecl-mcrypt php-sodium


phpmyadmin_-_importing_a_.csv_into_a_table
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:02:18+00:00
Import a CSV into MySQL with phpMyAdmin

Importing a CSV file which was saved from Excel 2007/2010 into MySQL using phpMyAdmin:




php_tricks
Anonymous (anonymous@undisclosed.example.com) — 2018-11-02T01:32:46+00:00
PHP Tips

Code tips:


$actual_link = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];
echo "Our URL: $actual_link

\n";

# the entire URL of the current page, including query string
$url = $_SERVER['REQUEST_URI'];
echo "\$_SERVER['REQUEST_URI'] ---> $url

\n";

# the base URL of the current page without query string
$url_base = $_SERVER['PHP_SELF'];
echo "\$_SERVER['PHP_SELF'] ---> $url_base

\n";

# The web host
$host = $_SERVER['HTTP_HOST'];
echo "\$_SERVER['HTTP_HOST']…


postfix_tips
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:02:51+00:00
Postfix tips

Logs are usually in /var/log/maillog.  Be root to perform commands below.

Show all messages in the queue:


postqueue -p


Delete messages in queue, by one or by all:


postsuper -d 
postsuper -d ALL


postgresql_tips
Anonymous (anonymous@undisclosed.example.com) — 2016-07-12T14:53:03+00:00
PostgreSQL Tips

Primary Key setup: 


public_dns_servers
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:53:38+00:00
Public DNS Servers

OpenDNS 

208.67.222.222 and/or 208.67.220.220

Google DNS 

8.8.8.8 and/or 8.8.4.4


python_alternative_upgrade_notes
Anonymous (anonymous@undisclosed.example.com) — 2023-02-02T19:43:38+00:00
Python Alternative Upgrade Notes

Python 3.11 on Rocky Linux 9:

Follow General Python 3.10 steps

For python 3.11, use 

If you get an error (at stage XXX) then check the permissions inside /opt/Python-3.11.1 directory and chown -R root:root then try again.

After installed, set a sym link in /usr/local/bin/python3.11 to /usr/local/bin/python


python_code_snippets
Anonymous (anonymous@undisclosed.example.com) — 2025-01-23T11:24:27+00:00
Python Coding Notes

Handling arguments
import argparse

parser = argparse.ArgumentParser(description='Collect arguments')
parser.add_argument("-t", required=True, type=str, help="Train number")
parser.add_argument("-s", required=True, type=str, help="Station")
parser.add_argument("-d", required=True, type=str, help="Date")

args = parser.parse_args()

train_num = args.t
station = args.s
date = args.d

print(train_num)
print(station)
print(date)


python_notes
Anonymous (anonymous@undisclosed.example.com) — 2023-04-05T12:56:58+00:00
Python Install Notes

5 Apr 2023
# python3 -m pip list --outdated
Package             Version         Latest          Type
------------------- --------------- --------------- -----
chromedriver-binary 110.0.5481.30.0 112.0.5615.28.0 sdist
mypy-extensions     0.4.3           1.0.0           wheel
pdf2image           1.16.2          1.16.3          wheel
pytesseract         0.3.8           0.3.9           wheel
pytz                2022.7.1        2023.3          wheel
urllib3             1.26.14  …


python_notes_work
Anonymous (anonymous@undisclosed.example.com) — 2020-09-29T19:53:05+00:00
Python Notes (work)

Get pygrib installed and working to plot meteorological data:

Is the following the solution, performing as root?
dnf config-manager --set-enabled PowerTools
dnf install python3-pygrib
dnf install python3-numpy
dnf install python3-scipy
dnf install python3-matplotlib*
dnf install python3-pyproj
dnf install python3-wheel
dnf install libcurl-devel
dnf install cairo-devel
dnf install parted-devel
dnf install gobject-introspection-devel
dnf install cups-devel
dnf install dbus-de…


python_virtual_environments
Anonymous (anonymous@undisclosed.example.com) — 2023-08-10T15:35:34+00:00
Python Virtual Environments

Overview to conda environments

Installing miniconda

	*  Download and install miniconda3 as non-admin user from 
	*  Get the "Miniconda3 Linux 64-bit" version
	*  NOTE: You may need to remove a $HOME/.condarc file if you have one to prevent repo source conflicts


qgis
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:03:30+00:00
QGIS



To install on Fedora 20:


sudo wget fedora.vitu.ch/QGIS/qgis.repo -P /etc/yum.repos.d/
sudo rpm --import http://fedora.vitu.ch/Fedora/RPM-GPG-Key-vitu
sudo yum update
sudo yum install qgis qgis-python qgis-grass qgis-mapserver


querying_x_windows_screen_resolution_settings
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:58:42+00:00
Query X Windows Screen Resolution Settings

To discover the X windows screen resolution currently being used, use this command:


$ xwininfo


quicklaunch_menu
Anonymous (anonymous@undisclosed.example.com) — 2010-02-19T00:45:45+00:00
1. Right click on the taskbar

2. Select : Toolbars--->"New Toolbar"

3. Enter this line in the folder line:

%SystemDrive%\Users\%username%\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch

4. Make sure the right folder appeared on the list, then press "Select Folder"


recommended_network_card_for_linux
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T22:59:06+00:00
Recommended Network Card for Linux

I have a HP Pavilion P7-1235 with the onboard Atheros Communications Inc. AR8161 Gigabit Ethernet (rev 08) card.  It was not recognized by CentOS 6.3.

Did some research and purchased an Intel Corporation 82574L Gigabit Network card.


recover_data_from_failed_netgear_stora_ms2110_nas
Anonymous (anonymous@undisclosed.example.com) — 2018-07-14T21:02:52+00:00
Recover Data from failed Netgear STORA MS2110 NAS

	*  The NETGEAR MS2110-1000NAS failed
	*  It would only power on but disks would not sync
	*  Attempts to forcefully reset it did not work

Below are the steps used to successfully access the data using 1 of the hard disks.  The main internet links used to establish this procedure are


redhat_for_developers_notes
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:06:19+00:00
Red Hat Enterprise Linux for Developers Notes

RHEL for Developers - No cost subscription

RHEL for Developers - Getting Started Guide

 RHEL Release Notes


reduce_pdf_file_size
Anonymous (anonymous@undisclosed.example.com) — 2025-11-06T03:31:18+00:00
Reduce PDF File Size


ps2pdf -dPDFSETTINGS=/ebook input.pdf output.pdf


remote_desktop_access_for_linux_using_xrdp
Anonymous (anonymous@undisclosed.example.com) — 2025-05-03T21:31:36+00:00
Remote Desktop Access for Linux Using xrdp

The notes below were adapted from How To Enable Remote Desktop Protocol Using xrdp on Ubuntu 22.04

	*  Ensure you have the Xfce Desktop Environment installed and working on the machine you want to access remotely.
		*  Consult Xfce install info as needed.

	*  dnf install xrdp
	*  As root, make a backup copy of


remote_desktop_tricks
Anonymous (anonymous@undisclosed.example.com) — 2025-05-03T02:17:03+00:00
Remote Desktop Clients for Linux

Potential programs for Linux:

rdesktop


rdesktop -a 32 -x 0x8F -g 1600x1200 -f HOST -u USERNAME -d DOMAIN


	*  connects to Windows Vista/7 at 32 bit
		*  Note that the "-a" option is not found in the man pages

	*


repair_xfs_filesystem
Anonymous (anonymous@undisclosed.example.com) — 2021-05-02T18:15:16+00:00
Repair XFS Filesystem (CentOS 7)

Obtain a rescue CD.

Hopefully the machine is still up and running, or can get to that point, so do the following:
df -hP

and note the device your problematic mount is located on.
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           1.9G     0  1.9G   0% /dev/shm
/dev/sda3        96G  4.8G   91G   5% /
/dev/sda1      1014M  224M  791M  23% /boot


resetting_root_password_in_grub
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:02:15+00:00
Reset root password with GRUB

Boot machine into GRUB loader. 

Highlight kernel you want to boot into.

Press (e) to edit boot process.

Add a space and append 'single' to the end of the boot sequence command line.

Press (b) to reboot machine.

Machine loads into root without a password.


restore_data_and_files_from_corrupted_disks
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:07:30+00:00
Restore Data and Files from Corrupted Disks

Excellent tool to recover lost photos, corrupted files from SD cards and such:





Other data recovery tools:




restricted_shell_access_for_users
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:04:49+00:00
Restricted shell access

Set up restricted shells to disable ssh, sftp, etc using rssh.




rhel6_login_screen_configuration
Anonymous (anonymous@undisclosed.example.com) — 2011-03-18T20:05:43+00:00
All,

In the past, we used to configure the login screens on RHEL 4 and 5 by
using the gdmsetup utility.  This utility is no longer available under
RHEL 6.

After opening a TAM ticket with Red Hat support, here is their answer on
how to change the RHEL 6 login screen:

Follow the steps below:

Note - Where a # is shown, it is the command line prompt for the root user

1) #gconf-editor
2) Select apps->gdm->simple-greeter
3) Check the 'banner_message_enable' checkbox
4) Right click on 'banner_mess…


rocky_linux_8_migration_notes
Anonymous (anonymous@undisclosed.example.com) — 2022-05-20T13:48:37+00:00
Rocky Linux 8 Migration Notes

Use this doc to migrate existing Centos 8 Stream: 


rocky_linux_9_migration_checklist
Anonymous (anonymous@undisclosed.example.com) — 2024-01-10T19:27:36+00:00
Rocky Linux 9 Migration Checklist

Installation

Post Installation


rocky_linux_9_migration_notes
Anonymous (anonymous@undisclosed.example.com) — 2026-03-02T13:26:04+00:00
Rocky Linux 9 Migration Notes

2025-10-20

Some kernels were missing from DNF repos; Virtual Box would not start after upgrading.  Downgraded to previous kernel, rebooted twice, and then it started OK.

2025-10-18

The network manager icon in the system try disappeared.  Had to do the following:


rocky_linux_10_migration_notes
Anonymous (anonymous@undisclosed.example.com) — 2026-01-12T13:04:47+00:00
Rocky Linux 10 Migration Notes

NOTE: The fresh install instructions below were tested on Rocky Linux 10.0 (which is based on Fedora 40)

The instructions below are a work in progress, using Rocky Linux 9 Migration Notes as a starting point and utilizing the Xfce Desktop Environment.

Downloaded the minimal ISO, did my basic install.


rsync_ignore_hidden_files
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:10:35+00:00
Ignore Hidden Files with rsync

To ignore hidden files, remember to use:


--exclude=".*"


samba_file_sharing
Anonymous (anonymous@undisclosed.example.com) — 2024-01-01T21:43:55+00:00
Samba File Sharing

Samba on CentOS Stream 9

Samba on Rocky Linux

Samba on RHEL8

UnixMen.com - Samba on CentOS 7

HowToForge - Samba on CentOS 7

 Samba on CentOS 6

	*  Consult old server's settings when migrating/upgrading to a new OS.
		*  Create the samba password like smbpasswd -a USER (then enter password at next prompt)

	*  Make sure service is running and will start at boot.


sanitizing_php_for_malicious_user_input
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:11:04+00:00
Sanitize PHP for Malicious User Input

All php input needs to be sanitized.  For example,

instead of just doing:


  $id = $_GET["id"];


change it to be something like:


if (isset($_GET["id"]) ) {
  $id = filter_input(INPUT_GET, 'id', FILTER_SANITIZE_STRING);
  if( preg_match("/^(al|ep)\d\d$/", $id) ) {
    $id = $id;
  } else $id = "";
} else $id = "";


self-signed_ssl_certificates
Anonymous (anonymous@undisclosed.example.com) — 2025-03-16T22:38:12+00:00
Self-signed SSL Certificates
# openssl req -new -days 365 -x509 -nodes -out /etc/pki/tls/certs/localhost.crt -keyout /etc/pki/tls/private/localhost.key

# systemctl restart httpd
Note that the "365" above can be increased to 99999, etc.

More info at


selinux_configuration
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:11:29+00:00
Configure SELinux for Apache HTTP


# system-config-securitylevel


Click SELinux Tab 


Click on Transition tree 


Check Enable or Disable SELinux protection for Apache HTTP 



# service httpd restart 
-or-
# /etc/init.d/httpd restart


sequence_of_numbers
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:11:42+00:00
Using seq to Create a Sequence of Numbers
$ seq -w -s " " 5 18
05 06 07 08 09 10 11 12 13 14 15 16 17 18

$ seq -w -s " " 9 3 48
09 12 15 18 21 24 27 30 33 36 39 42 45 48
-w adds zero padding

-s replaces the new line with a space

You can set the interval as shown with the "48" above.


serendipity_tips
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:08:58+00:00
Serendipity Tips

Serendipity - A PHP Blog

When installing, make sure you change permissions to apache:apache after untarring. 

Install php-gd for gdlib extension.


setting_system_clock_to_utc_gmt_timezone
Anonymous (anonymous@undisclosed.example.com) — 2017-04-06T00:11:54+00:00
System Clock Configuration to use UTC/GMT Timezone

For CentOS 7:



CentOS 7 now includes a tool to change the timezone, to view your current timezone run the following command


timedatectl


To change this to UTC (or to any other timezone) run the following:


share_usb_drive_on_home_network
Anonymous (anonymous@undisclosed.example.com) — 2019-04-16T13:51:26+00:00
Share USB Drive on Home Network



Notes:

	*  User will need account on target PC
	*  Setting permissions will only share the USB drive, not everything on the PC


skype_call_recorder
Anonymous (anonymous@undisclosed.example.com) — 2016-11-02T01:03:47+00:00
Skype-Call-Recorder

Do not use this software in a manner inconsistent with its intended use

Skype-Call-Recorder downloads

To install on CentOS7, use the source file v 0.11b - available here

Unzip, untar and follow the INSTALL instructions.

Installation notes:


Enable this REPO:

name=Nux.Ro RPMs for general desktop use
baseurl=http://li.nux.ro/download/nux/dextop/el7/$basearch/ http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/$basearch/
# disabled 5 June 2016 to avoid nux-desktop and skype…


skype_for_linux
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:09:38+00:00
Skype for Linux

As of version 4.3.0.37, download the tar file from Skype and install it in your $HOME (on CentOS 6) that way.  The RPM doesn't work out of the box; maybe it will work with hacking.

Then just make a desktop or panel launcher and call it to the executable you just installed.  Icons are also included (96x96 seems to work well).


soft_link_trick
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:12:22+00:00
Soft Links

Sometimes it's hard to remember the correct order for creating soft links.

Just remember "real --> ideal"


ln -s [real location] [ideal location]


sort_command_tricks
Anonymous (anonymous@undisclosed.example.com) — 2020-01-02T19:02:00+00:00
Linux 'sort' command tricks

Sorting by string length
$ awk '{ print length(), $0 | "sort -n" }'  /usr/share/dict/words


ssh_authentication_using_only_password_ignoring_keys
Anonymous (anonymous@undisclosed.example.com) — 2022-12-22T01:21:04+00:00
SSH authentication with only a password, ignoring keys
ssh -o PasswordAuthentication=yes -o PreferredAuthentications=keyboard-interactive,password -o PubkeyAuthentication=no machine.domain -l username


ssh_disable_reverse_dns
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:12:56+00:00
SSH Disable Reverse DNS




ssh_exchange_identification_error
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:13:13+00:00
ssh_exchange_identification error

Usually occurs when trying to ssh into a box and nothing happens.


Then the error message appears. 


check /etc/hosts.allow, /etc/hosts.deny


ssh_login_banners
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:13:52+00:00
SSH Login Banners

Put the banner message in /etc/issue 


Adjust the /etc/ssh/sshd_config file for the banner path 


Kill the sshd daemon:

ps -ef |grep sshd

Restart sshd:

service sshd restart


ssh_without_a_password_using_public_private_keys
Anonymous (anonymous@undisclosed.example.com) — 2025-06-08T18:51:24+00:00
SSH / rysnc without password

Make sure the same versions of ssh are on both machines. 

You need to configure both client (machine connecting from) and server (machine connecting to). 

On client, create ecdsa public and private keys (optionally you can also create rsa and dsa versions) with the following:


ssh_without_checking_known_hosts
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:15:10+00:00
SSH without checking known_hosts

To ssh from one box to another without checking the ~/.ssh/known_hosts file:


ssh -o StrictHostKeyChecking=no remotebox.domain.com


ssi_includes_with_php_and_vice-versa
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:16:00+00:00
HTML Server-Side includes (SSI) with PHP and vice-versa

To allow an .shtml file to parse a .php include:



    Options FollowSymLinks Includes Indexes
    IndexOptions +NameWidth=*



Then in the .shtml file use something like this:


start
Anonymous (anonymous@undisclosed.example.com) — 2026-02-19T01:24:14+00:00
Linux System Administration Tips and Tricks



Allowing passive FTP connections

Apache .htaccess but allow from IP address

awk examples

Bash Tips

Canon LiDE 70 scanner in Linux

Checking network speed

Cron Tips

C-Shell and other Linux custom prompts

Database Import-Export Tips

Disable Screen Blanking in Linux

Disable Terminal Bells

Distorted IE Images / Dell Laptop 1920x1200

Dokuwiki Reference Links 

Dynamic DNS and LetsEncrypt

Enigmail Setup and GnuPG keys

Error messages with /etc…


start_a_program_at_boot
Anonymous (anonymous@undisclosed.example.com) — 2016-04-24T12:25:34+00:00
Start a program at boot

For Windows 7: 

Add program files and folders to Windows System Startup

For Windows 10:

	*  Create a file like task.bat on the Desktop or in some other location.  Add this code:


start /min C:\Windows\System32\taskmgr.exe


	*  Then use Windows-R and enter shell:startup to access the Start Menu programs start up list


sudo_setup
Anonymous (anonymous@undisclosed.example.com) — 2016-07-15T13:23:44+00:00
Sudo Setup

CentOS7, see 


sunwait
Anonymous (anonymous@undisclosed.example.com) — 2019-09-23T00:53:58+00:00
Sunwait

Run a cron at sunrise/sunset or with some offset.



Examples:
$ sunwait -p 33.640411N 84.419853W
Using location:             33.640411N, 84.419853W
Date:                       20 Sep 2019 
Local time:                 18:31 
Day length:                 12:13 hours
With civil twilight         13:00 hours
With nautical twilight      13:59 hours
With astronomical twilight  14:57 hours
Length of twilight:  civil   0:23 hours
                  nautical   …


teleworking_tips
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:52:19+00:00
Telework Tips

Phone Calls 

Get a google voice number; that can forward to multiple phones.  And use that number for people to call you.  You can set up filters to only ring certain phones and at certain times of the day.

Consider unlimited VOIP calling plan through local Internet Service Provider.


thumbs.db_-_disabling
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:47:38+00:00
Disabling Thumbs.db

Windows 7 Home Premium:



Open the registry (regedit.exe) from the Run command and navigate to the following key:
  HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Explorer\Advanced
Double click on the DisableThumbnailCache key in the right-hand pane and change the value to 1. If the key is not there, go to Edit, then New and choose DWORD Value to create…


thunderbird_-_gmail_deletion_procedure
Anonymous (anonymous@undisclosed.example.com) — 2025-10-03T08:52:58+00:00
Thunderbird - Gmail Deletion Procedure

Use Thunderbird to easily find large Gmail email messages (you can sort by size).  You must do this using Gmail's "All Mail" folder in Thunderbird.

Identify a Local Thunderbird folder to keep a copy of the message if desired.


thunderbird_-_slow_performance
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:16:24+00:00
Thunderbird Slow Performance

Thunderbird acting slow and using up a large amount of CPU on Linux (RHEL6) could be caused by an Enigmail add-on.  When Enigmail is installed, the gpg-agent needs to be running.

See this page:  enigmail_setup_and_gnupg_keys


thunderbird_-_sort_folders_with_first
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:17:26+00:00
Thunderbird Sorting Folders with '_' (underscore) First

From bash:

export LC_COLLATE="C"

Then start thunderbird.




tightvnc_and_configs
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:10:21+00:00
TightVNC Notes

TightVNC Documentation 

TigerVNC Documentation


Remove presently-installed vnc client/server:


# yum remove vnc
# yum remove vnc-server


Download and install tightvnc client/server (note it has been replaced by tigervnc as of Fedora 11)


# yum install tigervnc
# yum install tigervnc-server
# vncserver


totem_movie_player
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:10:43+00:00
Totem Movie Player

Totem Movie Player will playback Logitech Security camera videos in realtime.

These MPEG packages are installed on an i686 system:


# rpm -qa |grep mpeg | sort
ffmpeg-0.6.5-1.el6.rf.i686
ffmpeg-libpostproc-0.6.5-1.el6.rf.i686
gstreamer-ffmpeg-0.10.11-1.el6.rf.i686
libmpeg2-0.5.1-2.el6.rf.i686


ubiquiti_edgerouter_6p_notes
Anonymous (anonymous@undisclosed.example.com) — 2025-03-22T15:03:24+00:00
Ubiquiti EdgeRouter 6P Notes

Firmware Downloads

Firmware Upgrade Instructions

Dual WAN Info: 


ubiquiti_unifi_access_point_notes
Anonymous (anonymous@undisclosed.example.com) — 2024-07-28T12:43:04+00:00
Ubiquiti Unifi Access Point Notes

UAP-AC-LR Firmware/Release Notes

UAP-AC-Pro Firmware/Release Notes

U6-Lite Firmware/Release Notes

24 July 2024

Updated to 6.6.73 from 6.6.55 (6.6.55 has been running for 5+ months with no issues)

	*  6.6.73 had disconnects on some 2.4 GHz IoT devices, mainly Wyze cameras.  Also slow streaming from those devices.  Rolled back to 6.6.55.


ubiquiti_unifi_controller_-_easy_installation
Anonymous (anonymous@undisclosed.example.com) — 2022-12-30T22:33:04+00:00
Ubiquiti UniFi controller - Easy Installation

The following is an easy recipe to install the Unifi Network Application to manage Unifi WiFi Access Points, especially on Ubunutu. 

As root, download and run Glenn R's Unifi Network Application "easy install script"

Make sure the firewall has been disabled on the Ubuntu machine.


ubiquiti_unifi_controller_-_migrating_to_new_server
Anonymous (anonymous@undisclosed.example.com) — 2023-07-19T17:58:07+00:00
Ubiquiti Unifi Controller - Migrating to new server

 

 




ubuntu_16_notes
Anonymous (anonymous@undisclosed.example.com) — 2021-02-21T16:07:22+00:00
VirtualBox running Ubuntu 16 Notes

I apparently never installed nor tested this version.


ubuntu_18_notes
Anonymous (anonymous@undisclosed.example.com) — 2021-05-17T20:05:43+00:00
VirtualBox running Ubuntu 18 Notes

20 Jul 2020

Updated VirtualBox to 6.1.12 and Ubuntu 18 would not login after MATE authentication screen (just got black screen).  Went into /opt/VBoxGuestAdditions-6.1.8 and uninstalled the Guest Additions.  Rebooted, logged in correctly.  Then installed latest version of GuestAdditions.  Rebooted again, logged in and all worked correctly.


ubuntu_20_notes
Anonymous (anonymous@undisclosed.example.com) — 2022-02-13T22:02:52+00:00
VirtualBox running Ubuntu 20 Notes

5 Oct 2021

Sometimes trying to boot into Ubuntu 20 from VirtualBox just results in a black screen with blinking cursor.  The last known version of VirtualBox to work was a "test" version, VirtualBox-6.1-6.1.27_146688_test_el7-1.x86_64.rpm but now it fails.


ubuntu_22_notes
Anonymous (anonymous@undisclosed.example.com) — 2023-01-19T22:36:18+00:00
VirtualBox running Ubuntu 22 Notes

Install and run linux-purge
linux-purge -s
linux-purge
linux-purge -m
New install May 2022

Set root password
sudo passwd root

Turn off screensaver

Add my .bashrc and my alias for apt updates:
alias au='apt update; apt -y upgrade'


ubuntu_26_notes
Anonymous (anonymous@undisclosed.example.com) — 2026-01-12T13:09:33+00:00
VirtualBox Running Ubuntu 26

- Notes to follow -


ubuntu_notes
Anonymous (anonymous@undisclosed.example.com) — 2021-02-21T16:09:29+00:00
VirtualBox running Ubuntu 14 Notes

	*  sudo apt-get install linux-headers-generic
	*  sudo apt-get install apache2
	*  sudo apt-get install mysql-server
	*  sudo apt-get install php5 libapache2-mod-php5
	*  sudo apt-get install gufw
	*  sudo apt-get install php5-mcrypt


unifi_install_source_script
Anonymous (anonymous@undisclosed.example.com) — 2019-10-11T15:06:57+00:00
Unifi install source script


#!/bin/bash

# UniFi Controller 5.11.48 auto installation script.
# OS       | List of supported Distributions/OS
#
#          | Ubuntu Precise Pangolin ( 12.04 )
#          | Ubuntu Trusty Tahr ( 14.04 )
#          | Ubuntu Xenial Xerus ( 16.04 )
#          | Ubuntu Bionic Beaver ( 18.04 )
#          | Ubuntu Cosmic Cuttlefish ( 18.10 )
#          | Ubuntu Disco Dingo  ( 19.04 )
#          | Ubuntu Eoan Ermine  ( 19.10 )
#          | Debian Jessie ( 8 )
#          …


unzip_untar_a_file_and_compile_code
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:18:17+00:00
Unzip, Untar, Compile from Source

Download the .tar.gz file in the destination directory 

Navigate to directory, gunzip  

tar –xvf  

cd to newly created directory 

At this point you need to check README.txt for specific instructions. What follows below are general instructions.


using_a_scanner_in_linux_with_xsane
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:19:32+00:00
Using a Scanner in Linux with XSane



XSane is a graphical scanning frontend for SANE (Scanner Access Now Easy). It uses the SANE-library to talk to scanners. This means that XSane does not support any scanners itself. 

XSane is designed for acquiring images with scanners (there are other devices like cameras and videodevices supported by SANE and you will see that xsane may support some basic functions of those devices, but XSane is not designed for that pu…


vim_tips
Anonymous (anonymous@undisclosed.example.com) — 2024-04-22T12:54:07+00:00
Vi and Vim Tips

Disable automatic comment insertion in vi (vim)



Create ~/.vimrc and insert this line:


autocmd FileType * setlocal formatoptions-=c formatoptions-=r formatoptions-=o
colorscheme ron


Colors: 

'peachpuff' may be another good color scheme unless colors are too dim.


virtualbox_for_centos_7_notes
Anonymous (anonymous@undisclosed.example.com) — 2020-05-16T19:42:24+00:00
VirtualBox running CentOS 7 Notes

April 2020 - Upgrade to CentOS 7.8:

Upgrade worked with no issues

September 2019 - Upgrade to CentOS 7.7:

Best practice is to clone a VM before upgrading so you have a clean starting point.

Got these errors upon trying to upgrade:


virtualbox_for_centos_7_to_centos_8_upgrade_in_place
Anonymous (anonymous@undisclosed.example.com) — 2021-04-15T21:25:54+00:00
VirtualBox for CentOS 7 to CentOS 8 Upgrade in Place

Notes for upgrading CentOS7 to CentOS8 in place:



	*  'rpm -e `rpm -q kernel`' would fail, try to erase current kernel
	*  'dnf --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync' would also fail, trying to remove the current kernel


virtualbox_for_centos_8_notes
Anonymous (anonymous@undisclosed.example.com) — 2020-12-09T21:56:37+00:00
VirtualBox running CentOS 8 Notes

9 December 2020

	*  Updated to CentOS Linux release 8.3.2011
	*  Booting into new kernel kept failing
		*  complained /boot ext4 filesystem was unknown

	*  Booted into previous kernel OK
	*  Did "rpm -qa |grep kernel | sort" and looked for all the latest versions


virtualbox_for_centos_stream_notes
Anonymous (anonymous@undisclosed.example.com) — 2021-10-25T15:27:12+00:00
Virtual Box running CentOS8 Stream

 Support Lifecycle





Converting from CentOS Linux to CentOS Stream:
root@centos-linux# dnf install centos-release-streamroot@centos-linux# dnf --allowerasing distro-syncroot@centos-stream# cat /etc/centos-release
CentOS Stream release 8


virtualbox_for_windows_10_notes
Anonymous (anonymous@undisclosed.example.com) — 2016-04-10T21:50:50+00:00
VirtualBox running Windows 10 (RC/Release Candidate) Notes

Installed on HP host computer with 16GB of RAM

Windows 10 installation set to use 2048MB base memory, 128MB video memory

Obtain Max Video Resolution (1920x1200)

Max Resolution on Windows 10 with Linux Host


su - root
cd /usr/bin
vboxmanage setextradata "Windows10-preview" CustomVideoMode1 1920x1600x32


virtualbox_general_notes
Anonymous (anonymous@undisclosed.example.com) — 2025-12-03T11:49:05+00:00
VirtualBox General Notes

Troubleshooting Slow Network Speeds when running VirtualBox on Windows:

	*  To fix slow VirtualBox network speeds in Windows, try changing the network adapter to virtio-net in the VM settings and use Bridged Mode instead of NAT.


virtualbox_notes
Anonymous (anonymous@undisclosed.example.com) — 2016-10-19T01:36:03+00:00
VirtualBox running CentOS 6 Notes



Other Tips for VBox Guest Additions on Fedora 22/21, CentOS/RHEL 7.1/6.7/5.11

Follow the provided installation instructions in the manual.

Note:  Just because the host machine is 64-bit does not mean the VirtualBox will run a guest 64-bit machine.  Processor limits of the host machine seem to be the culprit or certain manufacturer's chips seem to be the limit.


virtualbox_notes_for_centos5
Anonymous (anonymous@undisclosed.example.com) — 2013-06-24T18:21:52+00:00
If the install process hangs at:


NetLabel: initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4
NetLabel: unlabeled traffic allowed by default
NET: Registered protocol family 2


Then you must enable IO APIC for the guest in the settings dialog or append kernel boot parameter nolapic (for installation: linux nolapic | for installed CentOS guest: in grub append to the end of the line begining with kernel nolapic).


virtualbox_notes_for_fedora_17
Anonymous (anonymous@undisclosed.example.com) — 2022-11-29T20:48:22+00:00
VirtualBox running Fedora Notes

Fedora 37

Follow this: 

	*  MATE seems unavailable
	*  Try XFCE instead
	*  Proton VPN may not work

Fedora 36

DNS issues: 

Upgrading from Fedora 35 to Fedora 36

	*  Follow Fedora Docs
	*  Remember to clean up old packages and dangling symlinks


virtualbox_notes_for_rhel8
Anonymous (anonymous@undisclosed.example.com) — 2019-01-03T15:36:35+00:00
VirtualBox Notes for RHEL8

Registered at developers.redhat.com for a beta test.  Downloaded beta .iso and installed.

Registered system using:
# subscription-manager
# subscription-manager list
# subscription-manager attach
# subscription-manager list


virtualbox_running_rocky_linux_8
Anonymous (anonymous@undisclosed.example.com) — 2022-09-11T16:13:14+00:00
VirtualBox Running Rocky Linux 8

10 Sep 2022

Rocky Linux 8 "Perfect Desktop"

	*  Changed default Cantarell font to Droid

4 June 2022

After upgrading monitor on host system, a Rocky Linux VM would not boot into the latest, last-running kernel.  It would boot into previous kernels.  To fix:


virtualbox_running_rocky_linux_9
Anonymous (anonymous@undisclosed.example.com) — 2023-01-21T15:01:57+00:00
Rocky Linux 9 Notes

Installing Xfce

See if Rocky Linux 8 "Perfect Desktop" based on GNOME works on RL 9

	*  Changed default Cantarell font to Droid
	*  When starting Chrome, if you get a keyring error, see this fix


vmware_notes
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:22:07+00:00
VMware Notes

For screen resolution issues, in the virtual machine .vmx file add the following (or similar):


svga.maxWidth = "1600"
svga.maxHeight = "1200"


For VMware firewall settings:

/sbin/iptables -A INPUT -p tcp -m tcp --dport 8222 -j ACCEPT


vpn_notes
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:24:03+00:00
VPN Notes

Using CentOS VPNC, OpenVPN and Network Manager to get VPN services

First enable EPEL repo using one of these links:

	*  
	*  
	*  
	*  

epel.repo goes into /etc/yum.repos.d/ - something similar to this:


[epel]
name=Extra Packages for Enterprise Linux 6 - $b…


windows_7_line_spacing_icon_height
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:49:18+00:00
Windows 7 Line Spacing and Line Height

Windows 7 Line Spacing/Icon/Line Height

From the website:

...previous windows versions had smaller height (and no spacing) in list mode, using the screen real estate more efficiently.


windows_10_notes
Anonymous (anonymous@undisclosed.example.com) — 2019-03-15T23:56:13+00:00
Windows 10 Notes

----------

General Preparation

Windows 10 Clean Install Instructions

	*  When performing a clean install of Windows 10, use the Windows 7 license key printed on the computer or from your "Windows Anytime Upgrade" purchase receipt.  Windows 10 will recognize it as a valid license.


windows_folders_quicklaunch_menu
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:49:59+00:00
Windows Quick Launch Menu and Folders Tips

Enabling Quick Launch Menu 


1. Right click on the taskbar

2. Select : Toolbars--->"New Toolbar"

3. Enter this line in the folder line:

%SystemDrive%\Users\%username%\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch


windows_iso
Anonymous (anonymous@undisclosed.example.com) — 2023-06-14T17:28:06+00:00
Windows ISO

Discussion on Windows ISO images

Windows ISO Downloader

Note that you should be able to download the correct ISO file from the link above, make a disk and use the Product Key that is on the COA Sticker.


winscp_-_passwordless_login
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:51:31+00:00
Use WinSCP to login to a remote system without a password




working_with_rpms
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:08:06+00:00
Working with RPMs

RPMs on the web: 

 



Installing: 


rpm –ivh (name)

Listing Installed Packages: 


rpm –qa | grep (name) to find installed packages

Removing Packages: 


rpm –e (name)

Freshen packages: 


rpm –F *.rpm

Building RPM from source:


wyze_cam_older_firmware
Anonymous (anonymous@undisclosed.example.com) — 2026-02-19T01:24:54+00:00
Wyze Cam older firmware




xfce_notes
Anonymous (anonymous@undisclosed.example.com) — 2024-09-09T20:14:29+00:00
Xfce Notes

Install: 

Locking screen shortcut:
Applications > Settings > Keyboard
Click Application Shortcuts
Look for xflock4 in the list
Double-click the entry to program a new key, like Super-L (Windows-L)


xming_x_server_for_windows
Anonymous (anonymous@undisclosed.example.com) — 2025-03-21T00:13:48+00:00
Xming X Server for Windows




yum_installer_bash_script_centos7
Anonymous (anonymous@undisclosed.example.com) — 2022-12-07T18:24:49+00:00
Yum installer bash script (CentOS 7)

When you run the code below, ensure to redirect output and errors to a log file.

If this is a new install, consider the SELinux settings.


#!/bin/bash
#
# install-my-yum-packages.bash
#
# NOTES:
# This script may not install MATE in a VirtualBox environment seamlessly.
# May need to get MATE running first, then run this script.
#
# Installed groups can be found with:
# yum group list
#
# Contents of groups can be found with:
# yum group info "Group Name"
#…


yum_installer_bash_script_centos8
Anonymous (anonymous@undisclosed.example.com) — 2022-12-07T18:24:40+00:00
dnf installer bash script (CentOS 8)

When you run the code below, ensure to redirect output and errors to a log file.

If this is a new install, consider the SELinux settings.


#!/bin/bash
#
# install-my-dnf-packages.bash
# CentOS 8 version
#
# NOTES:
# Installed groups can be found with:
# dnf group list
#
# Contents of groups can be found with:
# dnf group info "Group Name"
#
# TO RUN:
# ./install-my-dnf-packages.bash > /tmp/install-my-dnf-packages.log 2>&1
#

echo ""
echo "*****************…


yum_installer_bash_script_centos8s
Anonymous (anonymous@undisclosed.example.com) — 2022-06-04T14:31:57+00:00
dnf installer bash script (CentOS 8 Stream and Rocky Linux 8)

When you run the code below, ensure to redirect output and errors to a log file.

Before using, ensure /etc/dnf/dnf.conf is set to use the fastest mirror, with a fix noted in Virtual Box running CentOS8 Stream


#!/bin/bash
#
# install-my-dnf-packages.bash
# CentOS 8 Stream / Rocky Linux 8 version
#
# NOTES:
# Installed groups can be found with:
# dnf group list
#
# Contents of groups can be found with:
# dnf group info "Group Name"
…


yum_won_t_update_unsubscriptable_object
Anonymous (anonymous@undisclosed.example.com) — 2025-03-20T23:24:31+00:00
Yum fails to update


yum clean metadata
yum -y update


Make sure yum-utils rpm is installed.  You can run yum-complete-transaction and it helps clean out incomplete yum jobs.