existvar — Apollo

8.0;existvar (exist_variable), revision 8.0, 84/03/15
EXISTVAR (EXIST_VARIABLE) -- Check that a variable is set.
usage:  EXISTVAR var_name [...]


FORMAT

  EXISTVAR var_name ...


  The  EXISTVAR  command  checks  to see if the variable name(s) declared as its
  argument(s) has a currently set value.  If  the  variable  is  currently  set,
  EXISTVAR  returns  a  "TRUE"  value.    If  the variable is not currently set,
  EXISTVAR returns "FALSE".  If you specify  more  than  one  variable  name  to
  check, all the variables must exist for EXISTVAR to return "TRUE".


ARGUMENTS

  var_name [...]
  (required)          Specify  the  variable name to be checked.  Multiple names
                     are permitted, separated by blanks.
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