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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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Specific to OSX.
With this command, you can check the difference between the volumes mounted and the volume in /etc/fstab.
This command removes all ruby gems except the default ones that can not be removed. It is based on http://geekystuff.net/2009/01/14/remove-all-ruby-gems/
This command will show the sum total of memory used in gigabytes by a program that spawns multiple instances of itself. Replace chrome with whatever program's memory usage you are investigating. This command is rather useless on software that only spawns a single instance of itself.
This lists the number of ogg/mp3/wav/flac files in each subdirectory of the current directory. The output can be sorted by piping it into "sort -n".
Shows all available keyboard bindings in bash. Pretty printing.
Fetches latest stable release version from first entry between tags
Checks for syntax errors in PHP files modified in current working copy of a Git repository.
Creates a temporary ram partition
to make a 3gb partition (Defaults to 1gb)
-c will count the number of times your search matches in the file.
Kills all processes with a certain string. This was done to kill all ssh sessions openned by zenoss which look like: usr/bin/ssh /opt/zenoss/bin/zenmodeler
If you run dpkg --clear-selections or have otherwise selected installed packages for deinstall, but want to undo it, run this. It will set all installed packages back to installed status so that they won't be removed by commands like "dpkg -Pa"
netstat will list all open ports on the system, unix sockets, tcp sockets and udp sockets. the t flag limits to tcp ports the l flag limits to listening ports and the n flag disables the translation of port to service ( ie :25 displayed instead of :smtp ). then grep for the port you are interested in preceeded by a colon.