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Random IPv4 address

Press ctrl+r in a bash shell and type a few letters of a previous command
In the sample output, I pressed ctrl+r and typed the letters las. I can't imagine how much typing this has saved me.

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Get decimal ascii code from character
printf treats first char after single ' as numeric equivalent

locate bin, src, and man file for a command

Stat each file in a directory
Possible simplification of egrep-awk-sort with find and -exec with xargs.

let the cow suggest some commit messages for you
No need to parse html page, website gives us a txt file :)

Easily decode unix-time (funtion)

Cleanup a (source) text file, removing trailing spaces/tabs and multiple consecutive blank lines
I used this command (in addition to a code formatting tool) to "cleanup" a bunch of PHP files


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