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Show what PID is listening on port 80 on Linux

Transform a portrait pdf in a landscape one with 2 pages per page
This is an example of the usage of pdfnup (you can find it in the 'pdfjam' package). With this command you can save ink/toner and paper (and thus trees!) when you print a pdf. This tools are very configurable, and you can make also 2x2, 3x2, 2x3 layouts, and more (the limit is your fantasy and the resolution of the printer :-) You must have installed pdfjam, pdflatex, and the LaTeX pdfpages package in your box.

A child process which survives the parent's death (for sure)
Test scenario: * Open xterm (or konsole, ...) * Start xeyes with: ( xeyes & ) * Close the xterminal The xeyes process should be still running.

Count files beneath current directory (including subfolders)

Install pip with Proxy
Installs pip packages defining a proxy

Display network pc "name" and "workgroup"
Checks for PC samba name and workgroup. Works fine for Windows hosts and Linux/UNIX PCs running Samba.

Currency Conversion
This works in Mac OS X (10.6.2) (natively comes with curl) usage: currency_convert $1(amount) $2(from_denomination) $3(to_denomination)

determine if tcp port is open
for udp nmap -sU -p 80 hostname

ROT13 whole file in vim.
gg puts the cursor at the begin g? ROT13 until the next mov G the EOF

Speed up or slow down video (and audio)
Usage: videospeed video_filename speedchange newfilename videospeed foo.mp4 0.5 foo_slow.mp4 Range of 0.5 (50%) - 2.0 (200%) is valid.


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