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Colorized grep in less
Get your colorized grep output in less(1). This involves two things: forcing grep to output colors even though it's not going to a terminal and telling less to handle those properly.

Rip a DVD to AVI format
Substitute whatever track number you want into the "dvd://1" parameter. The "-aid 128" is to select the English language.

create a nicely formatted example of a shell command and its output
Shell function which takes a bash command as its input, and displays the following formatted output: EXAMPLE: command OUTPUT: output from command

Find unused IPs on a given subnet

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Launch a command from a manpage
Launch a command from within a manpage, vim style. This is rather trivial, but can be very useful to try out the functions described in a manpage without actually quitting it (or switching to another console/screen/...).

execute a command in case of success or execute a command in case of failure

Given process ID print its environment variables

Get your external IP address
Yeah I know it's been up here a million times, but this service is a really clean and nice one. Nothing but your IP address on it. Actually I was to write something like this, and noticed this on appspot... ;)

Find usb device in realtime
Using this command you can track a moment when usb device was attached.


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