job control language

job control language \job control language\ (Computers)
   A programming language used to specify the manner, timing,
   and other requirements of execution of a task or set of tasks
   submitted for execution, especially in background, on a
   multitasking computer; a programming language for controlling
   job[7] execution. Abbreviated JCL.
   [PJC]
    

Job Control Language
JCL

   <language, operating system> (JCL) {IBM}'s supremely {rude}
   {script} language, used to control the execution of programs
   in IBM {OS/360}'s {batch} systems.  JCL has a very {fascist}
   {syntax}, and some versions will, for example, {barf} if two
   spaces appear where it expects one.

   Most programmers confronted with JCL simply copy a working
   file (or {card deck}), changing the file names.  Someone who
   actually understands and generates unique JCL is regarded with
   the mixed respect one gives to someone who memorises the phone
   book.  It is reported that hackers at IBM itself sometimes
   sing "Who's the breeder of the crud that mangles you and me?
   I-B-M, J-C-L, M-o-u-s-e" to the tune of the "Mickey Mouse
   Club" theme to express their opinion of the beast.

   As with {COBOL}, JCL is often used as an archetype of ugliness
   even by those who haven't experienced it.  However, no
   self-respecting {mainframe} {MVS} programmer would admit
   ignorance of JCL.

   See also {fear and loathing}.

   (1999-03-03)