man pages

From a terminal, type: man program name.

For example,
man babs

 babs(1)                       Basic Seismic Utilities BSU                       babs(1)

NAME
       babs - BSU program rectifies seismic traces (C-Language Version)

SYNOPSIS
       babs [  -h  |  infile    ]

DESCRIPTION
       Basic  Seismic  Utilities  (BSU) rectifies seismic traces by taking the absolute
       value.  Functionally equivalent to the master program, cmst.c, this  version  is
       cleaned  up  and  reflects the fact that there is only one command line argument
       necessary.  C-Language Version.

   Options
       -h     Online help giving details on command line arguments

       infile Input file name

   NOTE:
       If invoked with no options, will prompt user for input parameters.

   EXAMPLE:
       babs w001.seg

       File w001.seg is processed by babs.  Output traces are rectified.

FILES
       babsxxxx.seg
              named according to convention (first 4char babs, the next 4char  are  the
              first 4char of the input file name, suffix .seg)

       standard output
              produces a progress bar

       babsxxxx.lst
              Echo check of input parameters in listing file.

SEE ALSO
       bhelp(1),    cmst(1)