*** "Sean E. Russell" (ser.goredo=ser1.net) via [2026-10-14 09:08]:
>Hmm. Ok, so my bash substitutions, which I thought were POSIX, are not. TBH,
>I've been using Linux since 1995 but I don't believe I've ever used raw POSIX sh
>-- always csh, bash, or zsh -- so TIL.

I think most people use those kind of shells for interactive purposes.
But ((POSIX) shell) scripts are different things, of course. Personally
I use zsh, write some "#!/usr/bin/env zsh"-shebanged scripts for
convenience, but have to use "#!/bin/sh" to write portable POSIX ones.
Debian is a well-known distribution that started to actively clean out
so-called shell scripts, which were in fact full of bash-isms (so dash,
checkbashisms utilities were created). ALT Linux was another one, which
was aggressive in that task.

>Fair enough. Shebang at the beginning of every .do file works, although it's
>tedious, especially with redo which tends to explode *.do files.

Definitely. So if user is aware that he is writing non-POSIX .do
scripts, but willing to do so for convenience, REDO_SHELL would be
indeed helpful.

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