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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.
» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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-z: Specifies that nc should just scan for listening daemons, without sending any data to them
-u: Use UDP instead of the default option of TCP.
to unload Daemon, use: launchctl unload /Library/LaunchDaemons/.plist
use ethereal to generate a pcap file of and iax2 VOIP channel on the specified interface with a particular host
setting gdb with this option / breakpoint before running the process will cause it to break whenever an memory allocation operation is not kosher.