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Tells you where a command is in your $PATH, but also wether it's a link and to what.
You may also use the $(which foo) variant instead of backticks. I personnaly have an alias ll='ls -l'.

To get the CPU temperature continuously on the desktop
No need for a colon, and one less semicolon too. Also untested.

create an emergency swapfile when the existing swap space is getting tight
Create a temporary file that acts as swap space. In this example it's a 1GB file at the root of the file system. This additional capacity is added to the existing swap space.

Check variable has been set

check open ports without netstat or lsof

cpu and memory usage top 10 under Linux
The original version gives an error, here is the correct output

Salvage a borked terminal
This is more or less the same as 'reset', but with two advantages: the initial LF character makes sure you're starting a new line to the tty driver, the final one is more reliably a line-end as CR is often unset; and second, 'stty sane' is reliable on older UNIX systems, especially Berkeley-based ones.

Extract audio track from a video file using mencoder
Extracts an MP3 encoded audio stream from an input video file.

Get your external IP address ( 10 characters long )
Shortest url to a external IP-service, 10 characters.

check open ports without netstat or lsof


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