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Execute a sudo command remotely, without displaying the password
The ssh command alone will execute the sudo command remotely, but the password will be visible in the terminal as you type it. The two stty commands disable the terminal from echoing the password back to you, which makes the remote sudo act as it does locally.

Quickly ping range of IP adresses and return only those that are online

Arch Linux sort installed packages by size
This one-liner will output installed packages sorted by size in Kilobytes.

Play awesome rythmic noise using aplay
Try modifying the numbers in the "(i*(i>>8|i>>9)&46&i>>8))^(i&i>>13|i>>6)" part. Crudely stolen from http://www.xkcdb.com/9067

A command to post a message and an auto-shortened link to Twitter. The link shortening service is provide by TinyURL.
A command to post a message and an auto-shortened link to Twitter. The link shortening service is provided by TinyURL.

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"

remove oprhan package on debian based system

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.

diff process output
Execute a process or list of commands in the given interval and output the difference in output.

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


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