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Just a quick blog; I couldn't remember how to quickly rerun my last command in bash; yes, I could have pressed up and then enter, but still...

Bash also has a built in mechanism for this:

!!

This is the same as pressing up and enter; although, it can be more powerful, as you can add something like sudo to the beginning:

sudo !!

so for example:

$ /etc/init.d/really_long_filename stop
 * really_long_filename: superuser access required
$ sudo !!
stopped
$

saves a bit of typing there...

You can also look further back in your history and use

!-1 (same as !!)
!-2 command before last
!-3... etc.

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