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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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Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Pretty man pages under X
You're a developer - but it doesn't mean you have to slum it! Why not spice up your man page lookups by using a decent PDF viewer. I use 'xpdf' - maybe you prefer acroread, whatever, it's just as fast as plain dull ASCII on today's machines and you can still search for stuff - that's the main reason I use PDF and not PS.

Purge configuration files of removed packages on debian based systems
Purge all configuration files of removed packages

Find files that are older than x days
Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.

Find distro name and/or version/release
Works for most distributions, tested on Ubuntu, Fedora, CentOS, Gentoo, SUSE, RedHat. Debian and Slackware: $cat /etc/*version

Backup with versioning
Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net

Get NFL/MLB Scores/Time
change the nfl in the url to mlb or nba to get those score/times as well

Aptitude pattern match
Could be dangerous, if you have many packages all beginning with 'foo' or 'bar'. This will easily remove them all from your system.

Which fonts are installed?
See all fonts installed in your system

Search recursively to find a word or phrase in certain file types, such as C code
ack search recursively by default


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