From: Eric Blake <eblake@redhat.com>
To: Aragon Gouveia <aragon@phat.za.net>
Cc: dash@vger.kernel.org
Subject: Re: setvar MIA?
Date: Tue, 11 Jan 2011 10:00:33 -0700 [thread overview]
Message-ID: <4D2C8CB1.4070204@redhat.com> (raw)
In-Reply-To: <4D2C8B2C.3060001@phat.za.net>
[-- Attachment #1: Type: text/plain, Size: 687 bytes --]
On 01/11/2011 09:54 AM, Aragon Gouveia wrote:
> I wasn't sure of its status in POSIX. It is useful for declaring
> variable variables - tidier than eval and I imagine faster, eg.
>
> index="1"
> setvar var_${index} "value"
>
> Will emulate it with a local function - thanks.
Indeed, it looks like FreeBSD introduced it as shorthand for:
setvar() { eval $1=\$2; }
The speed difference between that function doing an eval and a shell
builtin would be in the noise. I don't know why FreeBSD even bothered
to pollute the namespace with a builtin like that.
--
Eric Blake eblake@redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 619 bytes --]
next prev parent reply other threads:[~2011-01-11 17:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-11 15:54 setvar MIA? Aragon Gouveia
2011-01-11 16:10 ` Eric Blake
2011-01-11 16:54 ` Aragon Gouveia
2011-01-11 17:00 ` Eric Blake [this message]
2011-01-11 19:58 ` Jilles Tjoelker
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=4D2C8CB1.4070204@redhat.com \
--to=eblake@redhat.com \
--cc=aragon@phat.za.net \
--cc=dash@vger.kernel.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.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox