A standard convention in Unix/Linux is to provide a simple usage message, by using an -h or --help flag to a command.

e.g.

ambeserver -h

will show you:
Usage: AMBEserver [-d] [-r] [-s speed] [-p port] [-i tty] [-v] [-x]\n

This shows you command line options to set the speed, port, and tty that ambeserver should use.