Commands for the wicked (109)

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uniq without pre-sorting
Reads stdin, and outputs each line only once - without sorting ahead of time. This does use more memory than your system's sort utility.

Top ten memory hogs
Inspired by #7065

Add existing user to a group

Make any command read line enabled (on *nix)
Enable readline even if the command line application is not using it.

Do command when logged in from certain ips using ssh
Place in ~/.bashrc If you login to a ssh server from different ips, sometimes you want to do something specific for each. e.g., quickly go into screen -x session from a phone, but not your desktop.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Gathering all MAC's in your local network
replace eth0 with your ethernet or wireless network interface.

Immediately put execute permission on any file saved/created in $HOME/bin

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

gain all mp3s in subfolders w/o encoding
This will search all subfolders for mp3's and gain them to more or less sane defaults (without reencoding). http://mp3gain.sourceforge.net/ required!


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