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

put all lines in comment where de word DEBUG is found

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

Copy all shared libraries for a binary to directory
When working with jailed environments you need to copy all the shared libraries to your jail environment. This is done by running ldd on a binary which needs to run inside the jail. This command will use the output from ldd to automatically copy the shared libraries to a folder of your choice.

A trash function for bash
apt-get install trash-cli Commandline program that allows you put folders or files in the standard KDE/Unity desktop trash.

Display the size of all your home's directories
Display the size (human reading) of all the directories in your home path (~).

Take a screenshot every 2 seconds
Take a screenshot every 2 seconds and save it as a png file

copy/mkdir and automatically create parent directories
The --parents option will cause cp or mkdir to automatically create the parent directory structure. $mkdir --parents /one/two/three/dir will create /one, /one/two, and /one/two/three as needed before creating dir. cp will copy files with their full directory structure into the target directory with this option. Thanks to Peter Leung at: http://linuxcommando.blogspot.com/2007/11/use-of-parents-flag-in-mkdir-and-c.html which has good examples of usage.

Find the 10 users that take up the most disk space

RTFM function
Some commands have more information on 'info' than in the man pages


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