-   Total ignorance, just type a command ....
$ snaprect
Insufficient parameters, try 'help=', 'help=?' or 'help=h',
Usage: snaprect in=??? out=??? ...
rectify a snapshot using selected particles and weight
 
-   Ok, so we try help=
$ snaprect help=
snaprect in=??? out=??? weight=1 rcut=0.0 times=all test= VERSION=1.3c
 
-   or help=h
$ snaprect help=h
in               : input file name [???]
out              : output file name [???]
weight           : weighting for particles [1]
rcut             : cutoff radius effective if > 0.0 [0.0]
times            : range of times to transform [all]
test             : Use this snapshot instead, to transform []
VERSION          : 22-aug-00 PJT [1.3c]
 
-   Or we can try and see if there is a unix manual page available:
$ man snaprect
  Note: many good manual viewers available, gman, tkman, cgi-man etc. Note: many good manual viewers available, gman, tkman, cgi-man etc.