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find available cpu frequencies on FreeBSD
Once you know the available frequencies for your CPU, they can be used to do things like set minimum CPU frequency for powerd so that it doesn't ramp down too slow on a server : /etc/sysctl.conf or /boot/loader.conf: debug.cpufreq.lowest=DESIRED FREQ HERE or at terminal sysctl debug.cpufreq.lowest=DESIRED FREQ HERE

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

Add a line to a file using sudo
This is the solution to the common mistake made by sudo newbies, since $ sudo echo "foo bar" >> /path/to/some/file does NOT add to the file as root. Alternatively, $ sudo echo "foo bar" > /path/to/some/file should be replaced by $ echo "foo bar" | sudo tee /path/to/some/file And you can add a >/dev/null in the end if you're not interested in the tee stdout : $ echo "foo bar" | sudo tee -a /path/to/some/file >/dev/null

Exit mc with 2 keystrokes
For those who like to hit instead of typing "exit" to leave the shell and find it annoying that it doesn't work in Midnight Commander, just press to switch to the subshell and now you can leave with

Unlock your KDE4 session remotely (for boxes locked by KDE lock utility)
Do the unlock KDE screen saver locked session with lightdm display manager used in Kubuntu 12.10 +

Generate random IP addresses
It never ends

List files by quoting or escaping special characters.
Tested and works on Linux.

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

Twit Amarok "now playing" song
Share your "now playing" Amarok song in twitter!

resolve short urls
since the most url shorteners respond with a header containing the Location: ... this works with most common shorteners


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