From: Stephane Chazelas <Stephane_Chazelas@yahoo.fr>
To: zsh-users@sunsite.dk
Subject: Re: handling of variables
Date: Tue, 1 Feb 2005 14:06:16 +0000 [thread overview]
Message-ID: <20050201140616.GA7449@sc> (raw)
In-Reply-To: <2005-02-01T12-49-14@devnull.michael-prokop.at>
On Tue, Feb 01, 2005 at 12:57:37PM +0100, Michael Prokop wrote:
> Hello,
>
> I'm just wondering about:
>
> % zsh -f
> % FOO=BAR /bin/echo "$FOO"
>
> %
>
> Why doesn't this work? Am I running out of coffee? :)
[...]
Because that calls echo with FOO=BAR in its environment, it's
not echo that expands "$FOO", it's the shell.
You can do:
FOO=BAR eval '/bin/echo "$FOO"'
Here, it's eval that expands "$FOO", so it makes sense to put
FOO=BAR in its /environment/.
(note that with POSIX shells (and zsh in sh emulation), it's
FOO=BAR command eval '/bin/echo "$FOO"'
otherwise $FOO retains its value even after the eval).
--
Stéphane
next prev parent reply other threads:[~2005-02-01 14:05 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 [this message]
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
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