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From: Kartik Agaram <akkartik@gmail.com>
To: zsh-workers@zsh.org
Subject: pipelines transmitting data even after redirecting stdout
Date: Thu, 30 May 2019 20:35:17 -0700	[thread overview]
Message-ID: <CANOtCLXNrgX+-wds6gAdm0LRJxZGUKJc3ZVOeVJhCGBGAaxdTw@mail.gmail.com> (raw)

In the rest of this message I'm running within a zsh sub-process
without any dotfiles or inherited environment variables:

env -i zsh -f

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? I've tested it on the following
systems and gotten identical results:

1. zsh 5.7.1 (x86_64-apple-darwin18.2.0) on Mac OS 10.14.5
2. zsh 5.4.2 on Ubuntu 18.04

(Please explicitly include my email address in responses.)

Thank you,
Kartik
http://akkartik.name/about

             reply	other threads:[~2019-05-31  3:36 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-31  3:35 Kartik Agaram [this message]
2019-05-31  4:33 ` Philippe Troin

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