Rerun the last command with sudo in unix

Have you ever executed a command in Unix and noticed the that you had to run it with sudo? Instead of typing the command again with “sudo” in front of it, just run:

$ sudo !!

EDIT (05/06/2011 @ 10:20 PM) Mathew pointed out that running

$ !! command

will put the command at the end of the line. For example

$ rails
$ !! server
#output
$ rails server

Basically the !! is a replacement for the previous line entered in the Linux shell.

Update: You can also use !$ for partial replacement. For example

$ mkdir temp_folder_to_delete
$ rm -rf !$ #short for rm -rf temp_folder_to_delete

-Matt