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pong is a utility that goes one step beyond ping by allowing you to check to see if a port is listening on an address. It issues a connect() call to that address / port pair and provides additional diagnostic information about the process.
Here is the help output from the command:
pong - A port-level ping utility. Version: 0.6.3 Usage: pong -h | [ [ [-v][-v] | [-q] ] <address> <port> ] -q Be quiet. -v Be verbose (stack v's for effect). -h Show help screen.
The distribution is C source and a number of pre-compiled binaries.
OS X (10.4) Universal binary
Linux (2.6) Static binary
FreeBSD (6) Static binary
This code is released under the BSD license.