Linux Cheatsheet

Files and Navigation

Command	Description
`ls`	list all files/folders on current dir
`ls -l`	formatted listing
`ls -la`	formatted listing including hidden files
`cd <dir>`	change directory to dir
`cd ..`	change to parent directory
`cd ./<dir>`	change to dir in parent directory
`cd`	change to home directory
`pwd`	show current directory
`mkdir <dir>`	create a directory dir
`rm <file>`	remove file
`rm -f <dir>`	force remove file
`rm -r <dir>`	remove directory dir
`rm -rf <dir>`	force remove directory dir
`rm -rf /`	It's like exploding a nuclear bomb targeting your entire operating system. NEVER USE IT!
`cp <file1> <file2>`	copy file1 to file2
`mv <file1> <file2>`	mv file1 to file2
`mv <file1> <dir/file2>`	mv file1 to dir as file2
`touch <file>`	create or update file
`cat <file>`	output contents of file
`cat > <file>`	write standard input into file
`cat » <file>`	append standard input into file
`tail -f <file>`	output contents of file as it grows

Command	Description
`ps`	display currently active processes
`ps aux`	detailed outputs
`kill pid`	kill process with process id (pid)
`killall proc`	kill all processes named proc

Command	Description
`ping host`	ping host
`whois domain`	get whois for domain
`dig domain`	get DNS for domain
`dig -x host`	reserve lookup host
`wget <file>`	download file
`wget -c <file>`	continue stopped download
`wget -r <url>`	recursively download file from url
`curl <url>`	output the webpage from url
`curl -o page.html url`	writes the page to page.html
`ssh -p port user@host`	connect using port
`ssh -D user@host`	connect and use bind port

Command	Description
`chmod`	change permission of file

order: owner/group/world → -rwxrwxrwx

Example:

* chmod 777 rwx for everyone * chmod 755 rwx for owner, rx for group and world