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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.

Install pip with Proxy
Installs pip packages defining a proxy

Set laptop display brightness
An alternative which does not require to be root

display a smiling smiley if the command succeeded and a sad smiley if the command failed
you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)

Determine next available UID
Typical usage would be in a script that would want the next open UID in a range (in this case 500-600)

Timer with sound alarm

Erase to factory a pendrive, disk or memory card, and watch the progress

Find default gateway

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

Recall last argument of previous command
!$ recalls the last argument of the previous command. This is very useful when you have to operate several operations on the same file for example.


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