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From: "Jérémie Roquet" <arkanosis@gmail.com>
To: Zsh Users <zsh-users@zsh.org>
Subject: $pipestatus and shell functions
Date: Mon, 11 Apr 2011 17:52:24 +0200	[thread overview]
Message-ID: <BANLkTimLwZCd462OWiNCt9Qb6hJAptmJ7Q@mail.gmail.com> (raw)

Hello,

I'm somewhat confused by the behaviour of the $pipestatus variable:

$ true | true ; echo $pipestatus
0 0
$ false | true ; echo $pipestatus
1 0
$ true | false ; echo $pipestatus
0 1
$ false | false ; echo $pipestatus
0 0
$ foo() { true }
$ true | foo ; echo $pipestatus
0 0
$ false | foo ; echo $pipestatus
1 0

So far, everything is fine for me, but then:

$ foo() { false | true }
$ true | foo ; echo $pipestatus
1 0
$ foo() { false | false }
$ true | foo ; echo $pipestatus
1 1
$ foo() { true | true | true }
$ false | foo ; echo $pipestatus
0 0 0

So $pipestatus is defeated by multiple pipelining…

Is this by design? If so, is there some not-so-complicated workaround
to get the exit code of process A in “ A | B ” for any B (ie. even if
B is itself a shell function with a pipe)?

Thanks in advance, best regards,

-- 
Jérémie


             reply	other threads:[~2011-04-11 16:20 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-11 15:52 Jérémie Roquet [this message]
2011-04-11 16:38 ` Peter Stephenson
2011-04-11 16:48   ` Peter Stephenson
2011-04-11 17:33     ` Jérémie Roquet

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