GNU bug report logs - #41539
[PATCH 1/2] size: Document that positional arguments can be store items.

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Message #20 received at 41539 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: zimoun <zimon.toutoune <at> gmail.com>
Cc: 41539 <at> debbugs.gnu.org, Pierre Neidhardt <mail <at> ambrevar.xyz>
Subject: Re: [bug#41539] [PATCH 1/2] size: Document that positional arguments
 can be store items.
Date: Fri, 29 May 2020 12:09:51 +0200

Hi,

zimoun <zimon.toutoune <at> gmail.com> skribis:

> On Fri, 29 May 2020 at 11:26, Pierre Neidhardt <mail <at> ambrevar.xyz> wrote:
>
>> >> +@example
>> >> +guix size $(guix system build config.scm)
>> >
>> > Please use backquotes instead of $(…), which is Bash-specific.
>>
>> Actually, it's not, $(...) is POSIX (you can test with Dash).
>> Backquotes are deprecated and have the downside of not nesting.
>
> Yes, $(...) is POSIX, AFAIK.
> And let quote what POSIX says: "Because of these inconsistent
> behaviors, the backquoted variety of command substitution is not
> recommended for new applications that nest command substitutions or
> attempt to embed complex scripts."
>
> https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu_chap02.html#tag_23_02_06_03

I stand corrected!  That’s news to me, but definitely good news.
I’m all for using $(…) from now on.

Thank you!

Ludo’.

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