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Re: Redirecting error message from ${parameter:?word}

From: Eli Schwartz
Subject: Re: Redirecting error message from ${parameter:?word}
Date: Sun, 12 Jan 2020 01:37:06 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1

On 1/11/20 5:33 PM, Andreas Kusalananda Kähäri wrote:
> Because it's the shell that produces the diagnostic message, not the
> printf command.  Redirecting the printf command's error stream will not
> do anything.
> To redirect the diagnostic message, you would have te redirect the
> shell's error stream.  You can do that by, for example, placing the
> printf in a subshell and redirecting that subshell's error stream:
> $ ( printf 'Hello, %s.\n' "${name:?}" ) 2>/dev/null
> $
> This is also equivalent to what happens in your second example where you
> redirect the script's error stream.

It should suffice to use any compound command; the simplest would be to
use { cmd; } 2>/dev/null

No subshell needed, which it seems is something the OP cared about.

Eli Schwartz
Arch Linux Bug Wrangler and Trusted User

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