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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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sum a column of numbers

modify a file in place with perl
changes THIS to THAT in all files matching fileglob* without using secondary files

restoring some data from a corrupted text file
man tac When there is a bad block in the middle of your file, you can see its begninning with `cat' and its end with `tac'. But both commands terminates with an error. So this sequence rebuilds a new file without badblock.

Delete all git branches except master
Delete all your branches except master (useful after archiving branches)

Download last file from index of

list files recursively by size

Check whether laptop is running on battery or cable
If you want to do the same in OS X... grep as necessary for information you need....

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Remove all unused kernels with apt-get
This should do the same thing and is about 70 chars shorter.

Create a single PDF from multiple images with ImageMagick
Given some images (jpg or other supported formats) in input, you obtain a single PDF file with an image for every page.


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