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Create a file of repeated, non-zero
dd can be used with /dev/zero to easily create a file of all zero-bytes. Pipe that through tr and use octal conversions to change the byte values from zero to 0xff (octal 0377). You can replace 0377 with the byte of your choice. You can also use \\0 and \\377 instead of the quoted version.

Display the top ten running processes - sorted by memory usage

Purge configuration files of removed packages on debian based systems

runs a X session within your X session
http://www.debian-administration.org/article/Running_multiple_X11_sessions

Processor / memory bandwidthd? in GB/s
Read 32GB zero's and throw them away. How fast is your system?

Tells you where a command is in your $PATH, but also wether it's a link and to what.
You may also use the $(which foo) variant instead of backticks. I personnaly have an alias ll='ls -l'.

Label EXT2/EXT3 File System

Calculate N!
Same as the seq/bc solution but without bc.

show ls colors with demo
This can show all ls colors, with a demo.

Hide or show Desktop Icons on MacOS
Hides all Files and Folders on the MacOS Desktop. To show files and folders, type "true" instead of "false". "Finder" at the end is case sensitive, "finder" doesn’t work


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