REXX

Restructured EXtended eXecutor

M. Cowlishaw, IBM about 1979

The original name was REX. They also called it System Product Interpreter. A scripting language for IBM VM and MVS systems, replacing EXEC2.

The REXX Language: A Practical Approach to Programming, Michael F. Cowlishaw, Prentice Hall, 1985.

PC-Rexx

For MS-DOS.

AREXX

For the Amiga.