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calculate the total size of files in specified directory (in Megabytes)
the command will calculate the size of hidden files

posts an xml file to a webservice with curl

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

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.

Play musical notes from octave of middle C
Are there any creative pieces of music that can be created using beep and the shell? I'd love to hear it!

rsync with progress bar.
transfer files from localhost to a remotehost.

Extend a logical volume to use up all the free space in a volume group

Remove invalid host keys from ~/.ssh/known_hosts
Useful if you have to tunnel ssh through a local port and it complains of the host key being different. Much easier than manually editing the file.

Create a html of information about you harddisk
www.fir3net.com

Backup with versioning
Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net


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