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List processes playing sound
When trying to play a sound you may sometimes get an error saying that your sound card is already used, but not by what process. This will list all processes playing sound, useful to kill processes that you no longer need but that keep using your sound card.

Get disk quota usage openvz using vzlist
OpenVZ: Get disk quota usage for your VEID

Clear filesystem memory cache
Found here: http://ubuntuforums.org/showthread.php?t=589975

Factory reset your android device via commandline.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Display condensed log in a tree-like format.
Display condensed log in a tree-like format.

Extract title from HTML files
previous version leaves lots of blank lines

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

get a rough estimate about how much disk space is used by all the currently installed debian packages
The vaule is expressed in megabytes

calculate md5 sums for every file in a directory tree
an alternative


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