Online Help:

Usage: /vol/vssp/local/trees/amma-4/linux/bin/exExtImgIO [options] 
   -optload () [] Load options from a file.  
   -optsave () [] Save options to a file.  
   -if () [] Input format 
   -of () [] Output format 
   -bw (FALSE) [FALSE] Convert via grey scale image. 
   -v (FALSE) [FALSE] Verbose mode 
   arg (testi.pgm) [testi.pgm] Input filename 
   arg (testo.pgm) [testo.pgm] Output filename 
   -help (TRUE) [FALSE] Print usage information.