combinePDF.sh: A BASH script of mine, that combines two pdfs into one, using Ghostscript.

nohup: A POSIX command useful for letting programs run, even when users who start them have logged out.
It works by letting the programs ignore the HUP Signal.

Screen: A terminal multiplexer, much like VNC but comparatively lightweight.
It gives the flexibility of starting program runs on one computer, and pulling them up later on others. Very useful for long running programs.
Many thanks to Jacob Egner for introducing me to it.

Turning off console bell: Here's a way of turning of the annoying bell sound on linux terminals. Type, 'xset b off' on terminal, if you are using X Windows.
Adding the following line to ~/.cshrc file works for tcsh:
set nobeep

trackFiles.pl: A perl script of mine, that tracks is any file of a watchlist changes, using the UNIX stat system call.