If you’ve ever messed with Linux and found yourself in a jam that X just cannot solve. You’re going to need to use the command line to hack your way out of trouble. Lucky for you, Scott Klarr put up some nicely formated PDF Linux (and more) printable cheat sheets with all the handy commands you will need to be a true *nix h4ck3r.
clipped from www.scottklarr.com

Linux-Unix cheat sheets – The ultimate collection

Linux Command Line Cheat Sheets

Linux Cheat Sheet

Linux Cheat Sheet

Linux Cheat Sheet

Linux Cheat Sheet
  blog it