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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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Find the package that installed a command

Function to output an ASCII character given its decimal equivalent
I've corrected the function. My octal conversion formula was completely wrong. Thanks to pgas at http://mywiki.wooledge.org/BashFAQ/071 for setting me straight. The new function is from pgas and is very fast.

Determine an image's dimensions
Simple use of ImageMagick identify function.

Replace Caps-lock with Control-key
You can return to defaults with "setxkbmap". More here: http://dailycli.blogspot.com/2009/12/xmodmap-replace-caps-lock-with-left.html

Check disk for bad sectors
Checks HDD for bad sectors, just like scandisk or chkdisk under some other operating system ;-).

ping a range of IP addresses
nmap accepts a wide variety of addressing notation, multiple targets/ranges, etc.

Run command in an ftp session
By putting ! in front of a command, we are able to run it from an ftp session.

Stream YouTube URL directly to mplayer.

Undo commit in Mercurial

Selecting a random file/folder of a folder
Also looks in subfolders


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