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Randomize lines in a file
Works in sort (GNU coreutils) 7.4, don't know when it was implemented but sometime the last 6 years.

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"

Check whether laptop is running on battery or cable
The original proc file doesn't exist on my system.

Stream (almost) any music track in mplayer
Just give it an artist and/or song at the end of the command as shown.

Recursive chmod all *.sh files within the current directory
This command is useful to recursively make executable all "*.sh" files in a folder. This command is useful to apply chmod recursively in a determined kind of file.

Run a command on a remote machine
This counts the number of httpd processes running.

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

MoscowML with editable input-line and history
Works also with SML/NJ and other interpreters or tools with interactive environments.

Remove audio stream from a media file
This syntax also works for ffmpeg as avconv is a fork of ffmpeg.

Gzip files older than 10 days matching *
Useful for a cron job that runs nightly, gzipping or alternatively deleting files from a specific directory that are older than 10 days (in this case)


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