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as commented by Urk...
-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.
-r : repeat mode