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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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Mount directories in different locations
Like symlinked directories, you can mount a directory at a different location. For example mounting a directory from one location in to the http root without having to make your program follow symlinks or change permissions when reading.

Line Separator That is Width of Terminal
Creates a line seperator that will be the width of your window.

find out how many days since given date
You can also do this for seconds, minutes, hours, etc... Can't use dates before the epoch, though.

Apache CLF access log format to CSV converter
- excel date compatible with a separate hour field - added a fixed 1 for easier request counter aggregation - split URL in directory, filename, fileext, query - used with tomcat valve with response bytes replaced by elapsed time

Print the IPv4 address of a given interface

Should I be sleeping?

Find chronological errors or bad timestamps in a Subversion repository
Lists revisions in a Subversion repository with a timestamp that doesn't follow the revision numbering order. If everything is OK, nothing is displayed.

The proper way to read kernel messages in realtime.

Convert (almost) any video file into webm format for online html5 streaming
If you're using the experimental vorbis encoder (homebrew version of libffmpeg)

extract email adresses from some file (or any other pattern)
find all email addresses in a file, printing each match. Addresses do not have to be alone on a line etc. For example you can grab them from HTML-formatted emails or CSV files, etc. Use a combination of $...|sort|uniq$ to filter them.


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