From: Stephane Chazelas <stephane@chazelas.org>
To: Ray Andrews <rayandrews@eastlink.ca>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: capture stderr in command substitution
Date: Mon, 25 Jan 2021 12:38:00 +0000 [thread overview]
Message-ID: <20210125123800.5vn5zvtn5sho2rim@chazelas.org> (raw)
In-Reply-To: <1eb9835c-3911-d4ea-6456-d9ad52ceffea@eastlink.ca>
2021-01-24 11:45:31 -0800, Ray Andrews:
> $ var=$(command)
>
> ... but $var doesn't pick up errors. Can it be forced?
[...]
var=$(cmd>&2)
like in any Korn/POSIX-like shell.
To capture only stdout:
{ var=$(cmd 2>&1 >&3 3>&-); } 3>&1
That is we need to redirect cmd's stdout back to what it was
originally (after having redirected cmd's stderr to the pipe),
using that extra fd 3 temporarily.
That's also standard sh syntax.
--
Stephane
next prev parent reply other threads:[~2021-01-25 12:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-24 19:45 Ray Andrews
2021-01-24 19:47 ` Axel Beckert
2021-01-25 15:15 ` Ray Andrews
2021-01-25 15:51 ` Vin Shelton
2021-01-25 16:28 ` Pier Paolo Grassi
2021-01-25 21:42 ` Bart Schaefer
2021-01-25 20:33 ` Ray Andrews
2021-01-25 12:38 ` Stephane Chazelas [this message]
2021-01-25 13:18 ` Stephane Chazelas
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