From: Philippe Troin <phil@fifi.org>
To: Kartik Agaram <akkartik@gmail.com>, zsh-workers@zsh.org
Subject: Re: pipelines transmitting data even after redirecting stdout
Date: Thu, 30 May 2019 21:33:17 -0700 [thread overview]
Message-ID: <dabe8f3b84aa58914282958467f3bf22f97306ed.camel@fifi.org> (raw)
In-Reply-To: <CANOtCLXNrgX+-wds6gAdm0LRJxZGUKJc3ZVOeVJhCGBGAaxdTw@mail.gmail.com>
On Thu, 2019-05-30 at 20:35 -0700, Kartik Agaram wrote:
> This command works as expected:
>
> % echo abc > /dev/null
> % # no output
>
> However, adding another pipestage to it is unexpected:
>
> % echo abc > /dev/null |cat
> abc # whoa!
>
> If I redirect stdout to a file I seem to get some `tee`-like behavior for free:
>
> % echo abc >x |cat
> abc
> % cat x
> abc
>
> Is this somehow expected behavior?
Yes, it's a feature called multios, check the zsh manpage MULTIOS
section for details or
http://zsh.sourceforge.net/Doc/Release/Redirection.html#Multios
Phil.
prev parent reply other threads:[~2019-05-31 4:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-31 3:35 Kartik Agaram
2019-05-31 4:33 ` Philippe Troin [this message]
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