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total percentage of memory use for all processes with a given name
This command will add up RAM usage of all processes whose name contains "java" and output the sum of percentages in HRF. Also, unlike the original #15430, it wont fail on processes with a usage of >9.9%. Pleases note that this command wont work reliably in use cases where a significant portion of processes involved are using less than 0.1% of RAM, because they will be counted as "0", even though a great number of them could add up to significant amounts.

Display the standard deviation of a column of numbers with awk
This will calculate a running standard deviation in one pass and should never have the possibility for overflow that can happen with other implementations. I suppose there is a potential for underflow in the corner case where the deltas are small or the values themselves are small.

Retry the previous command until it exits successfully

convert a mp4 video file to mp3 audio file (multiple files)

Updating the status on identi.ca using curl.
identica is an open source social networking and micro-blogging service. Based on Laconica, a micro-blogging software package built on the OpenMicroBlogging specification. http://identi.ca/

sync two folders except hidden files

Generate an XKCD #936 style 4 word passphrase (fast)
Some snippets posted are slow on big dictionaries, this one is fast.

open two files on top of each other in vim (one window, two panes)

List files
Shortcut to list files in the current path.

grep -v with multiple patterns.
You can use -e to pass multiple patterns.


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