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Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

power off system in X minutes
Replace 60 with the number of minutes until you want the machine to shut down. Alternatively give an absolute time in the format hh:mm (shutdown -h 9:30) Or shutdown right away (shutdown -h now)

Convert a Nero Image File to ISO
This line removes the 300k header from a Nero image file converting it to ISO format

Execute a command without saving it in the history
Prepending one or more spaces to your command won't be saved in history. Useful for pr0n or passwords on the commandline. Tested on BASH.

Calculate days on which Friday the 13th occurs
I removed the dependency of the English language

move all files older than 60 days to a folder

Create subversion undo point
Allows you to save progress without committing. To revert to an undo point, svn revert then apply the undo point with patch. $ svn revert -R . && patch -p0 < .undo/2009-03-27_08:08:11rev57 Similar: http://www.commandlinefu.com/commands/view/373/archive-all-files-containing-local-changes-svn

Change the extension of a filename by using rename to convert
This will change all files ending in .JPG to .jpg and will work with any file extension

Compression formats Benchmark
See: http://imgur.com/JgjK2.png for example. Do some serious benchmarking from the commandline. This will write to a file with the time it took to compress n bytes to the file (increasing by 1). Run: $ gnuplot -persist

formatting number with comma
it is not work with Cygwin's bash3.X. Test in Linux. use printf "%'f" number while it is floating point number


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