Bash cheatsheet

Navigation, pipes, permissions, and process helpers for a Linux shell.

Files and navigation

Command / topic	What it does
`pwd`	Print working directory
`ls -lah`	List files with sizes and permissions
`cd -`	Jump to the previous directory
`mkdir -p a/b`	Create nested directories
`cp -r src dest`	Copy recursively
`rm -ri path`	Interactive recursive delete

Pipes and text

Command / topic	What it does
`cmd \| less`	Page long output
`grep -RIn needle .`	Search recursively with line numbers
`sed -n '1,20p' file`	Print lines 1–20
`awk '{print $1}' file`	Print first column
`find . -name '*.js'`	Find files by name

Permissions and processes

Command / topic	What it does
`chmod u+x script.sh`	Make a script executable for you
`ps aux \| grep node`	Find a process
`kill -15 <pid>`	Ask a process to exit gracefully
`df -h`	Disk free space
`du -sh *`	Directory sizes

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