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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"

The command used by applications in OS X to determine whether a plist is "good". from Ed Marczak.
The check an entire folder is a one-liner: plutil -lint * | grep -v OK$ from Ed Marczak

Determine next available UID
better with accounts on ldap

Convert number of bytes to human readable filesize
Converts a number of bytes provided as input, to a human readable number.

Print a row of characters across the terminal
shorter than alternative

adjust laptop display hardware brightness [non root]

Download a numbered sequence of files

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

uniq without pre-sorting
Reads stdin, and outputs each line only once - without sorting ahead of time. This does use more memory than your system's sort utility.

Execute most recent command containing search string.
Execute the most recent command containing search string. This differs from !string as that only refers to the most recent command starting with search string.


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