From: Mikael Magnusson <mikachu@gmail.com>
To: dominik.vogt@gmx.de, Zsh Users <zsh-users@zsh.org>
Subject: Re: -u option does not work with recursive expansion?
Date: Fri, 15 Feb 2019 00:45:28 +0100 [thread overview]
Message-ID: <CAHYJk3QLzi=H7ZoM4mObfr1drKHpgfNA_KPPsP6oBQaGSqpoCg@mail.gmail.com> (raw)
In-Reply-To: <20190214230743.drgd47wuwapj5os3@gmx.de>
On 2/15/19, Dominik Vogt <dominik.vogt@gmx.de> wrote:
> Why does the recursive expansion of foo not trigger an error
> message with the -u option? Is that a bug? Is there some
> woraround to get the expected error behaviour in all cases?
>
> -- snip --
> set -u
> foo=bar
> unset bar
> # ==> bar: parameter not set
> echo $bar
> # ==> no error?
> echo ${${foo}}
> -- snip --
If the above command doesn't output bar, your shell is very broken. I
think you're confused about what ${${foo}} means though. Putting a ${}
inside another ${} doesn't perform indirect expansion, you need (P)
for that.
--
Mikael Magnusson
next prev parent reply other threads:[~2019-02-14 23:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 23:07 Dominik Vogt
2019-02-14 23:45 ` Mikael Magnusson [this message]
2019-02-15 0:41 ` Dominik Vogt
2019-02-15 1:10 ` Bart Schaefer
2019-02-15 1:41 ` Matthew Martin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAHYJk3QLzi=H7ZoM4mObfr1drKHpgfNA_KPPsP6oBQaGSqpoCg@mail.gmail.com' \
--to=mikachu@gmail.com \
--cc=dominik.vogt@gmx.de \
--cc=zsh-users@zsh.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).