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Simulate typing but with mistakes
The output will show jerk, then wonderful person since echo parses the \b character.

List all installed Debian packages
Should work on all systems that use dpkg and APT package management.

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.

Get all links from commandlinefu front page
You need to install WWW::Mechanize Perl module with # cpan -i WWW::Mezchanize or by searching mechanize | grep perl in your package manager With this command, you can get forms, images, headers too

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

Delete a file/directory walking subdirectories (bash4 or zsh)

from the console, start a second X server
This starts a very basic X session, with just a simple xterm. You can use this xterm to launch your preferred distant session. $ ssh -X john@otherbox gnome-session Try also startkde or fluxbox or xfce4-session. To switch between your two X servers, use CTRL+ALT+F7 and CTRL+ALT+F8.

remove hostname from known_hosts

kill a process(e.g. conky) by its name, useful when debugging conky:)

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"


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