IF

   Tests the value of an expression and, depending on the syntax
   specified, executes the following:

   o  One command following the THEN keyword if the expression is
      true

   o  Multiple commands following the $THEN command if the
      expression is true

   o  One or more commands following the $ELSE command if the
      expression is false

   Format

     $ IF  expression THEN [$] command

     or

     $ IF  expression

     $ THEN  [command]

     command

        .
        .
        .


     $ [ELSE]  [command]

     command

        .
        .
        .



     $ ENDIF

                                  NOTE

      VSI advises against assigning a symbolic name that is already
      a DCL command name. VSI especially discourages the assignment
      of symbols such as IF, THEN, ELSE, and GOTO, which can
      affect the interpretation of command procedures.

Additional information available:

Parameters      Examples