$ ./phd2.bin --help
Usage: phd2 [-?] [-i <num>] [-l <str>] [-R] [-s <str>] [-v]
-?, --help display this help and exit
-i, --instanceNumber=<num> sets the PHD2 instance number (default = 1)
-l, --load=<str> load settings from file and exit
-R, --Reset Reset all PHD2 settings to default values
-s, --save=<str> save settings to file and exit
-v, --version print the program version and exit
$ ./phd2.bin --version
2.6.12