From: Michael Prokop <news@michael-prokop.at>
To: zsh-users@sunsite.dk
Subject: Re: handling of variables
Date: Wed, 2 Feb 2005 23:43:30 +0100 [thread overview]
Message-ID: <2005-02-02T23-41-32@devnull.michael-prokop.at> (raw)
In-Reply-To: <200502011410.j11EAA9D029705@news01.csr.com>
* Peter Stephenson <pws@csr.com> [20050201 15:51]:
> Michael Prokop wrote:
> > I'm just wondering about:
> > % zsh -f
> > % FOO=BAR /bin/echo "$FOO"
> > %
> > Why doesn't this work? Am I running out of coffee? :)
> The sequence of interepretation is
> line gets parsed to <environment-assignment> <command+args>
> line gets expanded to /bin/echo "" (assuming FOO is currently empty)
> shell forks
> FOO=BAR is put in the environment
> shell execs /bin/echo ""
> Compare this with the result of
> FOO=BAR printenv FOO
> where the command itself examines the environment.
Thanks for explanation, Peter.
> > And I'm wondering what's happening at:
> > % zsh -f
> > % FOO=BAR BAR=FOO echo $FOO $BAR
> > % FOO=BAR BAR=FOO echo $FOO $BAR
> > BAR
> > %
> This looks suspiciously like a bug. The value of BAR is being restored
> after the echo, but the value of FOO isn't.
Ok. ;-)
Thanks also to Stephane for his explanation!
thx && regards,
-mika-
prev parent reply other threads:[~2005-02-02 22:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-01 11:57 Michael Prokop
2005-02-01 14:06 ` Stephane Chazelas
2005-02-01 14:10 ` Peter Stephenson
2005-02-01 15:24 ` Bart Schaefer
2005-02-01 16:40 ` Bart Schaefer
2005-02-02 22:43 ` Michael Prokop [this message]
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=2005-02-02T23-41-32@devnull.michael-prokop.at \
--to=news@michael-prokop.at \
--cc=zsh-users@sunsite.dk \
--cc=zsh@michael-prokop.at \
/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).