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Re: Arithmetic expansion with increments and output redirection

From: Chet Ramey
Subject: Re: Arithmetic expansion with increments and output redirection
Date: Wed, 24 Apr 2019 09:43:06 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 4/24/19 9:07 AM, Andreas Schwab wrote:

>> The /bin/true forces the use of an external command, which means a subshell
>> is forked.  The redirection occurs in the forked subshell.
> But the expansion isn't required to be performed in the subshell.  I
> don't see POSIX having any wording to require one or the other.  

I think the POSIX wording is carefully crafted to allow all behaviors.

> Doing
> the expansion before the fork looks reasonable, even if only to make it
> consistent with builtins.

Is that consistency more valuable than avoiding side effects?

``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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