* Different behaviour of zsh with two input redirections compared to all other POSIX shells I have installed
@ 2014-12-15 11:33 Axel Beckert
2014-12-15 11:46 ` Peter Stephenson
0 siblings, 1 reply; 3+ messages in thread
From: Axel Beckert @ 2014-12-15 11:33 UTC (permalink / raw)
To: zsh-workers
Hi,
while I was debugging some non-zsh related issue with "yes '' |
sometool", I noticed that zsh behaves differently in the following
(possibly neither common nor useful, likely esoteric :-) case:
~ → cat /tmp/bar.txt
bar
~ → zsh -c 'echo foo | cat -v < /tmp/bar.txt'
foo
bar
~ → bash -c 'echo foo | cat -v < /tmp/bar.txt'
bar
~ → dash -c 'echo foo | cat -v < /tmp/bar.txt'
bar
~ → ksh -c 'echo foo | cat -v < /tmp/bar.txt'
bar
~ → mksh -c 'echo foo | cat -v < /tmp/bar.txt'
bar
Interestingly some non-POSIX shells have the probably sanest approach:
~ → tcsh -c 'echo foo | cat -v < /tmp/bar.txt'
Ambiguous input redirect.
~ → csh -c 'echo foo | cat -v < /tmp/bar.txt'
Ambiguous input redirect.
(And yes, csh is _not_ a symlink to tcsh on that system. :-)
Is this expected/wanted zsh behaviour? Is this something we should fix
in zsh? And if so, should it rather behave like bash or like tcsh? :-)
I tend to tcsh's variant although I suspect that this could cause more
breakage than bash's behaviour.
Kind regards, Axel
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Different behaviour of zsh with two input redirections compared to all other POSIX shells I have installed
2014-12-15 11:33 Different behaviour of zsh with two input redirections compared to all other POSIX shells I have installed Axel Beckert
@ 2014-12-15 11:46 ` Peter Stephenson
2014-12-15 11:53 ` Axel Beckert
0 siblings, 1 reply; 3+ messages in thread
From: Peter Stephenson @ 2014-12-15 11:46 UTC (permalink / raw)
To: zsh-workers
On Mon, 15 Dec 2014 12:33:14 +0100
Axel Beckert <abe@deuxchevaux.org> wrote:
> Is this expected/wanted zsh behaviour? Is this something we should fix
> in zsh? And if so, should it rather behave like bash or like tcsh? :-)
You'll need to try with "unsetopt multios" before comparing with other
shells. (I'm not suggesting that necessarily removes all issues...)
pws
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Different behaviour of zsh with two input redirections compared to all other POSIX shells I have installed
2014-12-15 11:46 ` Peter Stephenson
@ 2014-12-15 11:53 ` Axel Beckert
0 siblings, 0 replies; 3+ messages in thread
From: Axel Beckert @ 2014-12-15 11:53 UTC (permalink / raw)
To: zsh-workers
Hi Peter,
On Mon, Dec 15, 2014 at 11:46:57AM +0000, Peter Stephenson wrote:
> On Mon, 15 Dec 2014 12:33:14 +0100
> Axel Beckert <abe@deuxchevaux.org> wrote:
> > Is this expected/wanted zsh behaviour? Is this something we should fix
> > in zsh? And if so, should it rather behave like bash or like tcsh? :-)
>
> You'll need to try with "unsetopt multios" before comparing with other
> shells. (I'm not suggesting that necessarily removes all issues...)
Thanks for that hint. I knew about multiple output redirection being a
zsh-only feature, but I didn't expect that this also affects input
redirection in the same way despite it makes sense (now).
And indeed:
~ → zsh -o nomultios -c 'echo foo | cat -v < /tmp/bar.txt'
bar
So it's not a bug, it's a feature! Thanks again. :-)
Kind regards, Axel
--
/~\ Plain Text Ribbon Campaign | Axel Beckert
\ / Say No to HTML in E-Mail and News | abe@deuxchevaux.org (Mail)
X See http://www.nonhtmlmail.org/campaign.html | abe@noone.org (Mail+Jabber)
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-12-15 11:33 Different behaviour of zsh with two input redirections compared to all other POSIX shells I have installed Axel Beckert
2014-12-15 11:46 ` Peter Stephenson
2014-12-15 11:53 ` Axel Beckert
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