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The Object REXX programming language is an object-oriented scripting language initially produced by IBM for the operating system OS/2. It is a follow-on to and a significant extension of the "Classic Rexx" language originally created for the Conversational Monitor System (CMS) component of the operating system VM/SP and later ported to Multiple Virtual Storage (MVS),[3] OS/2 and PC DOS. OS/2 version of IBM Object REXX is deeply integrated with IBM System Object Model (SOM).[4]

Object REXX
Rexx3 orig size transparent.gif
ParadigmObject-oriented (class-based)
Designed bySimon C. Nash (IBM)
First appeared1988; 31 years ago (1988)
Stable release
4.2.0 / 24 February 2014; 5 years ago (2014-02-24)
OSCross-platform: AIX, Linux, OS/2; Windows NT
LicenseCPL 1.0, GPLv2
Filename extensions.rxs, .rex
Major implementations
ooREXX (since 2004)
Influenced by
Rexx, Smalltalk[1]

On October 12, 2004, IBM released Object REXX as free and open-source software,[5] giving rise to Open Object Rexx (ooREXX), now available for various operating systems: Linux, Solaris, Windows. This implementation includes a Windows Script Host (WSH) Scripting Engine for Rexx. The released sources however didn't include significant part of the SOM support.[6]

Object REXX supports multiple inheritance via the use of mixin classes.


  1. ^ René Jansen (2011-12-01). "7 Reasons that Rexx Still Matters". SmartBear blog. Retrieved 2014-02-02.
  2. ^ "NetRexx – Programming language derived from Java and Rexx". OS/2 EWS. IBM PC BBS. 1996. Retrieved 2014-01-24.
  3. ^ As part of Time Sharing Option (TSO) Extensions (TSO/E)
  4. ^ Willis Boughton (2004). "SOM and Object REXX". EDM/2. Retrieved 2014-02-02.
  5. ^ "IBM Contributes Scripting Language to the Rexx Language Association, Encourages Innovation Around REXX Application Development". IBM. 2004-11-29. Retrieved 2009-06-25.
  6. ^ Where did SOM support go in 4.0.0?

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