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Url Encode
This one uses hex conversion to do the converting and is in shell/sed only (should probably still use the python/perl version).

backup local MySQL database into a folder and removes older then 5 days backups

Display which user run process from given port name
Display which user run process from given port name

clear screen, keep prompt at eye-level (faster than clear(1), tput cl, etc.)
this leaves the cursor at the bottom of the terminal screen, where your eyes are. ctrl-l moves it to the top, forcing you to look up.

extracting audio and video from a movie
rips the audio and video stream of a movie. The two streams are stored separately.

See system users

Rename files in batch

Find unused IPs on a given subnet

open manpage and search for a string
This will open the manpage for "foobar", and display all instances of "searched_string". You can traverse through them by pressing "n"

An alias to re-run last command with sudo. Similar to "sudo !!"
I didn't come up with this myself, but I always add this to my .bash_aliases file. It's essentially the same idea as running "sudo !!" except it's much easier to type. (You can't just alias "sudo !!", it doesn't really work for reasons I don't understand.) "fc" is a shell built-in for editing and re-running previous commands. The -l flag tells it to display the line rather than edit it, and the -n command tells it to omit the line number. -1 tells it to print the previous line. For more detail: $help fc


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