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Re-read partition table on specified device without rebooting system (here /dev/sda).

Trigger a command each time a file is created in a directory (inotify)
Listens for events in the directory. Each created file is displayed on stdout. Then each fileline is read by the loop and a command is run. This can be used to force permissions in a directory, as an alternative for umask. More details: http://en.positon.org/post/A-solution-to-the-umask-problem%3A-inotify-to-force-permissions

AWK Calculator

Alias for getting OpenPGP keys for Launchpad PPAs on Ubuntu
Makes it easy to add keys to new ppa sources entries in apt sources.list Now to add the key for the chromium-daily ppa: $ launchpadkey 4E5E17B5

Arch Linux: Search for missing libraries using pacman
If, while using a program, you get an error similar to: error while loading shared libraries: libusb-0.1.so.4: cannot open shared object file: No such file or directory Use pacman or pkgfile to search for the package that owns the missing library https://wiki.archlinux.org/index.php/General_troubleshooting#Message:_%22error_while_loading_shared_libraries%22

mplayer webcam window for screencasts
When recording screencast some people like to have the image from their webcam, so the can show something, that can't be seen on the desktop. So starting mplayer with these parameters you will have a window with no frames, borders whatsoever, and selecting the window a hitting the "F" key you will bring it in fullscreen. if you want to position the frame somewhere else, you could play with the --geomeptry option where 100%:100% mean bottom right corner. The HEIGHT and WIDTH can't be changed as you like, since the most webcams support specified dimensions, so you would have to play with it to see what is supported

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.

connects to a serial console
cu (call UNIX) establishes a full-duplex connection to another machine (*BSD) using a serial console. It becames more useful than screen if you have to send a BREAK signal. using cu just type "~#". $man cu http://www.openbsd.org/cgi-bin/man.cgi?query=cu&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html

Get International Space Station sighting information for your city
This command outputs a table of sighting opportunities for the International Space Station. Find the URL for your city here: http://spaceflight.nasa.gov/realdata/sightings/

intercept stdout/stderr of another process
similar to the previous command, but with more friendly output (tested on linux)


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