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  Sorting in REXX: The Bubble Sort
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  Reserved REXX Variables
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           Home   > REXX   > Reserved REXX Variables

Reserved REXX Variables

What REXX variables are already defined? Which variables should you not use for any other purpose?
 Reserved REXX Variables

REXX has three variables with a predefined meaning. 
Using these for anything but their original purpose will cause 10% of your brain cells to deteriorate...
 is the numeric return code of any operating system or environment command.
A zero means that there were no problems. A positive number indicates some problem. 
A negative number tells of a serious problem. 
REXX does not understand these codes. 
The operating system command manual will explain them.

SIGL is the line number of the source program that sent control 
to a subroutine, internal function, or condition trap.
	Say "Line #" SIGL "sent control to this subroutine"

RESULT is the character string or number returned by a function (built-in or user-written) 
when it is invoked with a CALL.
User-written functions must set this by placing a character string or number on their RETURN statement. 
Built-in functions do it automatically. 
	/* in the main part of your program*/


	/* or*/
	CALL My_function
		/*reminder - RESULT is set only after a CALL*/


	/* does some processing */
	RETURN /*character string or number goes here*/

REXX Programming Book for TSO (published 2012)

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