From: Stephane Chazelas <stephane_chazelas@yahoo.fr>
To: Chet Ramey <chet.ramey@case.edu>
Cc: Peter Stephenson <Peter.Stephenson@csr.com>, zsh-users@zsh.org
Subject: Re: {fd}< and compound commands
Date: Thu, 15 Sep 2011 15:21:30 +0100 [thread overview]
Message-ID: <20110915142130.GC5497@yahoo.fr> (raw)
In-Reply-To: <4E71FC1B.8080608@case.edu>
2011-09-15 09:22:35 -0400, Chet Ramey:
> On 9/15/11 9:09 AM, Peter Stephenson wrote:
>
> >> does that feature come from another shell/language?
> >
> > Yes, we discussed it. I think one of us (not me) suggested the syntax.
>
> Oliver Kiddle.
[...]
Oh, I hadn't realised bash supported it too (since
bash-4.1-alpha according to CHANGES).
For completeness, looks like bash behaves like ksh93 (no close,
works with compound commands).
So looks like if we want to be portable accross all 3 shells,
we'd need to write it:
exec {fd}> file
... >&$fd
exec {fd}>&-
BTW, zsh protects its own internal fds. Looks like bash and
ksh93 don't:
~$ zsh -c 'fd=11; exec {fd}>&-'
zsh:1: file descriptor 11 used by shell, not closed
~$ bash -c 'fd=10; { exec {fd}>&-; } 2> /dev/null; echo test >&2'
~$ ksh93 -c 'fd=10; { exec {fd}>&-; } 2> /dev/null; echo test >&2'
~$
--
Stephane
next prev parent reply other threads:[~2011-09-15 14:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-14 17:21 Stephane Chazelas
2011-09-14 17:36 ` Mikael Magnusson
2011-09-14 19:06 ` Peter Stephenson
2011-09-14 19:31 ` Stephane Chazelas
2011-09-14 21:05 ` Peter Stephenson
2011-09-15 12:58 ` Stephane Chazelas
2011-09-15 13:09 ` Peter Stephenson
2011-09-15 13:22 ` Chet Ramey
2011-09-15 14:21 ` Stephane Chazelas [this message]
2011-09-17 12:21 ` Stephane Chazelas
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