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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.

Programmatic way to find and set your timezone

list block devices
Shows all block devices in a tree with descruptions of what they are.

Download all mp3's listed in an html page

get a rough estimate about how much disk space is used by all the currently installed debian packages
The vaule is expressed in megabytes

ping a range of IP addresses
nmap accepts a wide variety of addressing notation, multiple targets/ranges, etc.

Go to parent directory of filename edited in last command

Close shell keeping all subprocess running

Gentoo: Get the size of all installed packets, sorted
On a Gentoo system, this command will tell you which packets you have installed and sort them by how much space they consume. Good for finding out space-hogs when tidying up disk space.

Show what PID is listening on port 80 on Linux


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