Public Domain Korn Shell
From Rosetta Code
pdksh is the public domain Korn shell, a clone of the Korn Shell. It has most of the ksh88 features, and almost none of the ksh93 features.
- If an example from Rosetta Code "works with pdksh", then someone might have tested the example with one of these patched versions of pdksh.
- If a #!/bin/sh script "works with pdksh", then the tester might have used OpenBSD, where both /bin/ksh and /bin/sh are pdksh.