4.0; if, revision 5.0, 82/10/07
IF -- Execute a conditional statement.
usage:  IF command_1 THEN command_2  [ELSE command_3...] ENDIF


FORMAT

  If command_1 THEN command_2 ... [ELSE command_3 ...] ENDIF


  IF executes a conditional statement depending on the results of a Boolean
  test.  In a Shell script, the IF command may extend over several lines;
  interactively, it must appear in a single command line.  (Use @<RETURN> to
  continue long interactive command lines.)


ARGUMENTS

  command_1
  (required)       Specify command or program to execute and test for truth.
                   "Truth" usually means that the command executes
                   successfully,  without any errors.  Specifically, this
                   argument is evaluated TRUE if it returns an abort severity
                   level of 0 (zero).

  command_2
  (required)       Specify command or program to execute if command_1 returns
                   TRUE.

  command_3
  (optional)       Specify command or program to execute if command_1 returns
                   FALSE (i.e., a severity level greater than zero).


EXAMPLE

  1. $ IF eqs a a THEN args "a is a" ELSE args "Aristotle was wrong." ENDIF
     a is a
     $

  2. $ IF eqs ^2 '-c' THEN pas ^1 ELSE bind ^1.bin library -b ^1 ENDIF

  Example 2 will compile the Pascal module named by the first argument (^1) if
  the second argument (^2) is '-c'.  Then it will bind the module with
  'library'.  If the second argument is not '-c', or if there is no second
  argument, the command simply binds the module.


RELATED TOPICS

  More information is available.  Type:

    - HELP ABTSEV
      for information about abort severity levels.