[Bug 46441] sh(1): Does not support PS1, PS2, PS4 parameter expansion

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From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 29 May 2022 10:03:58 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=46441

--- Comment #14 from Piotr Pawel Stefaniak <pstef@freebsd.org> ---
To expand a bit on what I was thinking, in the context of PS4 and

> The problem with unbounded recursion from command substitutions is avoided by not allowing command substitutions

my idea was to allow recursion bounded to the stack depth of 2 or perhaps some
other low number that would allow simple PS4='`date`' or similar, but not
anything more fancy.

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