Screen or GNU Screen is a terminal multiplexer. In other words, it means that you can start a screen session and then open any number of windows (virtual terminals). This does not contain all of screen’s commands and options, read GNU’s manual to see everything
rTorrent is a command-line torrent application. Here are some shortcut keys.
Here’s some hints on using sed.
Quick reference to ANSI color codes.
GnuPG is a complete and free implementation of the OpenPGP standard.
See the processes in your Unix machine.
mattgreen/watchexec runs commands whenever certain files change.
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