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1.
Finest compression avaliable under UNIX/Linux! Unfortunatly, there is no decompressor avaliable.

Command issued on unix systems to remove a directory. If nothing is added after the final slash (/) it will remove the root filesystem. Although, many systems now have protection in place which will report back and say 'rm of / is not allowed' or similar. The command can only be issued by the root user. If you do it as a normal user, it will only remove your home directory and files you have write/execute access to.
Friend 1: My hard disk is full.
Friend 2: Type 'rm -rf /'. Its the best compression avaliable *evil-grin*.
Friend 1: Its doing it now, the hard disk is running.
by Keld July 14, 2005
 
2.
Probably the most popular unix command. The response linux newbies get from experienced users when asking for anything.
new_linux_user: How can I install an .rpm?
arrogant_guru: rm -rf /
*the newbie types the command*
*the newbie leaves crying*
by Rush July 16, 2005
 
3.
rm = remove
-f = all files whether write protected or not without prompting the user for confirmation or writing a message to the console about the file removal.
-r is recursive, which means to repeatedly remove all files until the base case is the only thing left.
There is a whole directory of files you no longer need on your UNIX system. You do not want to remove them one at a time. Use rm -rf/ to remove them all at once.
by frederick eccher jr November 03, 2004
 
4.
Destroying you. Used in *nix to remove all files from root tree. Equalevalent to 'go to fucking hell, bitch'
Joe: Screw you
Me: rm -rf /
by xbmodder March 04, 2005
 
5.
Read Mail Really Fast rtfm
"I have too much spam"
"use rm -rf /, read mail reall fast"
by tsixla April 14, 2003