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Re: access the stdin of the parent process in a pipeline

From: Chet Ramey
Subject: Re: access the stdin of the parent process in a pipeline
Date: Thu, 26 Mar 2020 14:54:55 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 3/26/20 1:06 PM, Peng Yu wrote:
> On 3/25/20, Mike Jonkmans <address@hidden> wrote:
>> Apart from the redirection as part of a function declaration,
>> you can also use compund commands, as Chet already mentioned.
>> One hardly see these constructs in system scripts.
>> Though they are properly documented in the bash manual.
>> Sometimes a 'subshell function' may be useful :
>>      f() ( ... )
> The above is a little strange as the `function` keyword does not work
> here without the `()` (as in the commented code below). I'd prefer to
> use the function keyword without the first `()` as the typical usage
> (`()` really doesn't do anything semantically).

The parser puts higher priority on the ( being the opening of a () to
complete the function definition than on being the opening of a subshell
command, and so the grammar requires the closing ).

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden

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