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       COMMAND

        sssseeeettttvvvvaaaarrrr ---- sssseeeetttt eeeennnnvvvviiiirrrroooonnnnmmmmeeeennnntttt vvvvaaaarrrriiiiaaaabbbblllleeee vvvvaaaalllluuuueeee

       USAGE

       sssseeeettttvvvvaaaarrrr _v_a_r_i_a_b_l_e _v_a_l_u_e

       DESCRIPTION

       The program uses a large set of environment variables to
       control its behavior.  These are initialized when the
       program is first started.  Several environment files are
       read to initialize variables specific to your site.  Many of
       these may be changed to suit your needs.  Others are
       dependent on either graphics hardware, file structures or
       digitizer type.  These must be changed with care.

       The current value of a variable may be changed with this
       command.  To be useful, _v_a_r_i_a_b_l_e must be one of the
       environment variables defined in the appendix (defaults.h).
       You should follow its name with a space and the new value.
       The value must be of the proper type, either numeric or
       text.  Text values will be read to the end of the line if
       necessary.  Numeric values should be either integers or
       reals depending on the type indicated in the appendix.  Copy
       the value formats in the appendix.

       Variable names are always uppercase words separated by
       underlines.





























