Online Help:

Usage: /vol/vssp/local/trees/amma-4/linux/bin/ex_gnum [options] 
   -optload () [] Load options from a file.  
   -optsave () [] Save options to a file.  
   -h (0.01) [0.01] stepsize 
   -n (10) [10] iterations 
   -help (TRUE) [FALSE] Print usage information.