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Re: lastpipe and "*may* be run by the shell process"
From: |
Chet Ramey |
Subject: |
Re: lastpipe and "*may* be run by the shell process" |
Date: |
Mon, 11 May 2020 16:57:16 -0400 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 |
On 5/11/20 3:15 PM, Andreas Kusalananda Kähäri wrote:
> Hi,
>
> I was recently answering a bash-related query in another context, and
> found myself quoting the bash (5.0.17(1)-release) manual:
>
> Each command in a pipeline is executed as a separate
> process (i.e., in a subshell). See COMMAND EXECUTION
> ENVIRONMENT for a description of a subshell environment.
> If the lastpipe option is enabled using the shopt
> builtin (see the description of shopt below), the last
> element of a pipeline may be run by the shell process.
>
> What caught my eye was the word "may" in the last sentence, and it
> struck me that I couldn't immediately think of a case where this word
> couldn't be "will" instead. That is to say, where setting the lastpipe
> shell option did *not* cause the last part of a pipeline to run in the
> invoking shell environment.
If job control is enabled.
--
``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/