Re: zsh in sh compatibility mode splits IFS slightly differently from other shells

[Bart Schaefer <schaefer@brasslantern.com>]

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On Wed, Jul 24, 2019, 1:03 AM Avery Pennarun <apenwarr@gmail.com> wrote:

> Hi all,
>
> I think this may be a known bug, as you can see it documented here:
> https://www.in-ulm.de/~mascheck/various/ifs/
>
> However, it bit users of one of my scripts lately
> (https://github.com/apenwarr/redo/blob/master/minimal/do) because it
> was accidentally depending on the non-sh behaviour.
>
> Simple test:
>
> emulate sh
> x="/a/b/c/"
> IFS=/
> f() {
>     echo "$2" "$#"
> }
> f $x
>
> On zsh, this prints:
>    a 5
>
> on bash, dash, mksh, ksh93, and posh (at least), this prints:
>    a 4
>
> I've already worked around the problem in my script, but it would be
> nice if nobody ever has to experience this again. Would it be possible
> to change zsh to match other shells' behaviour, at least when in sh
> compatibility mode?
>
> Thanks,
>
> Avery
>