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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Dump bash command history of an active shell user.

Make sudo forget password instantly
By default sudo 'remembers' password for a few minutes, so that you do not need to re-enter password for a series of sudo commands that might follow within a short time duration. However, sometime you might want sudo to instantly 'forget' the password. (Next sudo command will need you to reenter the password) Credit: I first learned this while listening to one of the 'tuxradar' podcast.

ssh autocomplete based on ~/.ssh/config
I use this in my bashrc to expand hosts defined in ~/.ssh/config: function _ssh_completion() { perl -ne 'print "$1 " if /^Host (.+)$/' ~/.ssh/config } complete -W "$(_ssh_completion)" ssh Here's a great article on how to setup your own ~/.ssh/config: http://blogs.perl.org/users/smylers/2011/08/ssh-productivity-tips.html

list with full path
List the full path of some files. You can add ".*" on the end if you want to display hidden files.

cat stdout of multiple commands
Concatenate the stdout of multiple commands.

display date of last time a process was started in `date` format
STARTED Mon Oct 18 04:02:01 2010

List only directories, one per line
omit the 1 (one) if you don't need one-per-line

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Get all the keyboard shortcuts in screen
Displays a list of all the basic keyboard shortcuts in screen.


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