The title should be "What's your favorite Linux scripting language?" Presumably you don't want to talk about Powershell (Windows), Javascript (Web), or Apache Groovy (JVM).
[prhodes@whiskey pdfs]$ dnf search rexx
Last metadata expiration check: 0:29:48 ago on Sat 06 Jul 2019 10:50:28 PM EDT.
========================================================== Name & Summary Matched: rexx ==========================================================
oorexx.x86_64 : Open Object Rexx
oorexx.x86_64 : Open Object Rexx
oorexx-libs.x86_64 : Libraries for ooRexx
oorexx-libs.i686 : Libraries for ooRexx
oorexx-libs.x86_64 : Libraries for ooRexx
brexx.x86_64 : Classic Rexx Implementation
oorexx-docs.x86_64 : Documentation for ooRexx
oorexx-docs.x86_64 : Documentation for ooRexx
rexx-imc.x86_64 : IMC's interpreter for the Rexx
oorexx-devel.x86_64 : Header files and libraries for ooRexx
oorexx-devel.i686 : Header files and libraries for ooRexx
oorexx-devel.x86_64 : Header files and libraries for ooRexx
indentit|6 years ago
wglb|6 years ago
mindcrime|6 years ago
FWIW, Rexx is readily available on Linux.