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Dump mySQL db from Remote Database to Local Database
You can use this to dump you database from remote db to your local db.

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.

List the popular module namespaces on CPAN
Grabs the complete module list from CPAN, pulls the first column, ditches html lines, counts, ditches small namespaces.

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.

Download all images from a 4chan thread
first grep all href images then sed the url part then wget

clone a hard drive to a remote directory via ssh tunnel, and compressing the image

Create a directory and change into it at the same time
How often do you make a directory (or series of directories) and then change into it to do whatever? 99% of the time that is what I do. This BASH function 'md' will make the directory path then immediately change to the new directory. By using the 'mkdir -p' switch, the intermediate directories are created as well if they do not exist.

Download and install the newest dropbox beta

Assign function keys to your frequent commands
This is a common use of bind. Hitting any key after will output the key's character sequence. This makes possible using it into a bind command. So pressing ctrl+v and then F2 will output "^[[12~", once binded every time you'll press the function key F2 it will execute your command. Added the \n to make it execute it as well.

a short counter
Maybe you know shorter ?


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