I feel like I would somehow be remiss if I did not point out that the formidable Rick Troth just put XFL, which is more-or-less a port of CMS/TSO Pipelines to POSIX, up on GitHub.
https://github.com/trothtech/xflI will confess to thinking CMS Pipelines are pretty cool.
THAT WAS MOSTLY TOM DUFF, BUT YES.
Rob doubtless got IBM out of his system back in the
late 1970s, when I think he was one of the authors
of a shell that brought the TSO experience to Unix.