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Report the established connections for a particular port

list files recursively by size

list all file extensions in a directory
If your grep doesn't have an -o option, you can use sed instead.

Mirror rubygems.org
https://github.com/rubygems/rubygems-mirror/issues/20

Filter the output of a file continously using tail and grep
The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.

rotate the compiz cube via command line
0-1279 = desktop 1 region = face 1 1280-2559 = face 2 ==>> wmctrl 1280 = wmctrl (1281,...2559) are all the same for a 1280 monitor resolution math: argument of wmctrl -o = ( DesiredFace * HorizontalResolution - 1)

recursively walk down no more than three levels and grab any file with an extension of mp3, mpg, mpeg, or avi

Send a local file via email
This just reads in a local file and sends it via email. Works with text or binary. *Requires* local mail server.

Find out how old a web page is
I used to use the Firefox "View page info" feature a lot to determine how stale the web page I was looking at was. Now that I use mostly Chrome I miss that feature, so here is a command line alternative using wget. The -S says to display the server response, the --spider says to not download any files/pages, just fetch the header. The output goes to stderr, so to grep it you use 2>&1 to combine the stderr stream with stdout, the pipe that to grep for Last-Modified. You can use curl instead if you have it installed, like this: $ curl --head -s http://osswin.sourceforge.net | grep Mod

Sort and count subjects of emails stuck in Exim queue


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