engineering:computer_science:linux:linux_cheatsheet

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engineering:computer_science:linux:linux_cheatsheet [2024/08/16 13:56] – removed - external edit (Unknown date) 127.0.0.1engineering:computer_science:linux:linux_cheatsheet [2026/01/11 15:45] (current) – external edit 127.0.0.1
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 +====== Linux Cheatsheet ======
 +
 +[[engineering:computer_science:linux:linux|Linux]] Cheatsheet
 +
 +===== Jobs: =====
 +
 +^Command^Description^Syntax^Example^Notes|
 +|jobs|List jobs running in the background|<code bash>
 +jobs
 +
 +
 +</code>       |jobs| |
 +|bg|Changes a job to the background.|<code bash>
 +bg %n
 +
 +
 +</code>       |bg %1|<n> being the value from a job.|
 +|fg|Changes a job to the foreground.|<code bash>
 +fg %n
 +
 +
 +</code>       |fg %2|<n> being the value from a job.|
 +
 +\\
 +
 +
 +===== tmux =====
 +
 +^Command^Description^Syntax|
 +|tmux list-sessions|Shows all live tmux sessions|<code>
 +tmux list-sessions
 +
 +</code>  |
 +|tmux attach| \\ Attaches to the last active tmux session. \\  \\ The session can be specified. \\ |<code>
 +tmux attach
 +
 +</code><code>
 +tmux attach-session -t <sessionNumber>
 +
 +</code>  |
 +|CTRL+B - D|Dettachs to the current tmux session|<code>
 +CTRL+B - D
 +
 +</code>       |
 +|CTRL+B - %|Creates a New Horizontally Aligned Tab|<code>
 +CTRL+B - %
 +
 +</code>       |
 +|CTRL+B - "|Creates a New Vertically Aligned Tab|<code>
 +CTRL+B - "
 +
 +</code>       |
 +|CTRL+B - Arrows|Moves to existent Tabs|<code>
 +CTRL+B - Arrows
 +
 +</code>       |
 +
 +\\
 +
 +
 +===== Disks and File Transfer: =====
 +
 +^Command^Description^Syntax^Notes|
 +| \\ scp -r * remoteuser@remoteserver:/remote/folder/  |Copy all files and folders recursively from local to remote|<code>
 +scp -r * remoteuser@remoteserver:/remote/folder/
 +
 +</code>       |   |
 +|du -sh /mnt/zebrabackup01/test  |Shows folder size|<code>
 +du -sh /mnt/zebrabackup01/test
 +
 +</code>       | |
 +|ls|Shows object cont in folder|<code bash>
 +ls | wc -l
 +
 +
 +</code>       | |
 +|<code bash>
 +du -smh * | sort -nr | head -15
 +
 +
 +</code>       |List Files by Size in Human Readable Way > Sort and Reverse it > Show Top 15|<code bash>
 +du -smh * | sort -nr | head -15
 +
 +
 +</code>       |   |
 +
 +\\
 +
 +
 +===== Administration: =====
 +
 +^Command^Description^Syntax^Notes|
 +|ip a \\ **OR** \\ ifconfig|Check your machine IPs|<code bash>
 +ip a
 +
 +
 +</code>     <code bash>
 +ifconfig
 +
 +
 +</code>       | |
 +|dmidecode –type memory|Shows the installed memory on your system|<code bash>
 +dmidecode --type memory
 +
 +
 +</code>       |   |
 +|<code bash>
 +find /var/log -type f -regex ".*\.gz$"
 +find /var/log -type f -regex ".*\.[0-9]$"
 +
 +
 +</code>       |Find Rotated and Compressed Logs|<code bash>
 +find /var/log -type f -regex ".*\.gz$"
 +find /var/log -type f -regex ".*\.[0-9]$"
 +
 +
 +</code>       |Add '-delete' to actually delete the files found.  |
 +|<code bash>
 +for CLEAN in $(find /var/log/ -type f)
 +do
 +    cp /dev/null  $CLEAN
 +done
 +
 +
 +</code>       |Empty all Log Files|<code bash>
 +for CLEAN in $(find /var/log/ -type f)
 +do
 +    cp /dev/null  $CLEAN
 +done
 +
 +
 +</code>       |Deleting the files can cause issues. Emptying them is safer and recommended.  |
 +|<code>
 +sudo !!
 +
 +</code>       |Re-run last command as root|<code>
 +nano /etc/example.log
 +sudo !!
 +
 +</code>       |   |
 +|CTRL+x+e  |Opens an editor, to create long / complex commands. Runs on saving|In Terminal: \\ CTRL+x+e \\ ls -l \\ CTRL+X \\ ENTER| |
 +|fc  |Opens the last command in an editor to make it easier to fix it.|<code>
 +fc
 +
 +</code>     | |
 +|disown -a && exit  |Exit Terminal but leave all processes running|<code>
 +disown -a && exit
 +
 +</code>     | |
 +
 +\\
 +