Issue a Linux command without it going into history
Thanks to jduck for pointing it out, but you need to actually make a change to get this to work, reference: http://www.catonmat.net/blog/the-definitive-guide-to-bash-command-line-history/ and search for: Modifying History Behavior
You simply put a space before it
Works well for backdoors you don’t want caught via the .bash_history as well ;-)
More CCDC tricks as I think of them..