Linux
	General commands
		cat / echo
		ls
		less / more
		diff
		grep / cut / head / tail
		cp / mv / rm / ln
		mkdir / rmdir
		clear
		touch
		man

	Input/Output
		piping "|"
		redirect ">" "<"

	Quick editor overview
		vi / emacs / nano

	Permissions
		chmod / chown / chgrp

	Archive / Compression
		tar / gzip / bz2
		************************************************
		to tar and gizp a folder and it's contents:

			tar -cvzf somefile.tar.gz foldername/

		to uncompress and extract files from a tarball

			tar -xvzf somefile.tar.gz
		************************************************

	Running processes
		fg / bg
		top / ps / kill / killall

	Shells
		sh / bash / csh

	SSH
		x forwarding
		Tunneling
		*passwordless login

	Other
		xargs
		who
		screen