Online Help:

Usage: /vol/vssp/local/trees/amma-4/linux/bin/vectool [options] 
   -optload () [] Load options from a file.  
   -optsave () [] Save options to a file.  
   -mu (0) [0] load n .vec files  0.vec ... n-1.vec 
   -i () [] input  filename .vec .asc
   -o () [] output filename .vec .asc .fld
   -l (FALSE) [FALSE] show limits
   -ra (FALSE) [FALSE] randomize all the points
   -m (FALSE) [FALSE] normalize each point to unit length
   -n (0) [0] truncate the vectorset to n elements 
   -help (TRUE) [FALSE] Print usage information. 

Dependancies:
   -i is compulsory.
   -o is compulsory.