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Re: [Help-bash] Best way to suppress the error message in $(< nonexisten


From: Chet Ramey
Subject: Re: [Help-bash] Best way to suppress the error message in $(< nonexistent_file)
Date: Wed, 28 Nov 2018 08:41:09 -0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 11/28/18 7:56 AM, Peng Yu wrote:
>> $ echo >&-
>> -bash: echo: write error: Bad file descriptor
>>
>> So an application using this descriptor may eg. crash.
> 
> I don't quite understand. Why this command does not cause any error?
> 
> { x=$( <doesnotexist) ;} 2>&-

Because the error message is written while stderr is still closed. It's
not restored until the group command completes.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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