Basics

A small Linux cheat sheet, introducing the very basic and very essential commands for surviving at the Linux CLI.

Moving around in the file system

Command	Action
pwd	"Print working directory" - show what dir you're in.
ls	List the contents of a dir.
ls -l	List the contents of a dir and show additional info of the files.
ls -a	List all files, including hidden files.
cd	Change directory.
cd ..	Go to the parent directory.

Examining files

Command	Action
file	Determine the type of a file.
cat	Concatenate a file.
less	View text files and paginate them if needed.

Manipulating files and directories

Command	Action
cp	Copy a file.
cp -i	Copy a file and ask before overwriting.
cp -r	Copy a directory with its contents.
mv	Move or rename a file.
mv -i	Move or rename a file and ask before overwriting.
rm	Remove a file.
rm -r	Remove a directory with its contents.
rm -i	Ask before removing a file. Good to use with the -r option.
mkdir	Make a directory.
rmdir	Remove an empty directory.

Files and directory Permissions

Command	Action
chown	Change ownership
chgrp	Change group
chmod	Change permissions

NOTE: Calculate permissions automatically using the Linux Permission Chart Table