Thanks, very helpful! I had gotten as far as the Chicken and Chibi links. I've put this on http://bitbucket.org/cowan/r7rs-wg1-infra/src/default/PosixLinks.md

On Thu, May 9, 2019 at 12:00 PM Lassi Kortela <xxxxxx@lassi.io> wrote:

Racket
https://docs.racket-lang.org/reference/os.html

GNU CLISP (Common Lisp):
https://clisp.sourceforge.io/impnotes/shell.html
https://clisp.sourceforge.io/impnotes/syscalls.html

SBCL (Common Lisp):
http://www.sbcl.org/manual/#Support-For-Unix
http://www.sbcl.org/manual/#sb_002dposix