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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 09:11:12 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 4/23/19 5:49 PM, Ian Neal wrote:

> Bash Version: 4.2
> Patch Level: 46
> Release Status: release
> Description:
>     When using arithmetic expansion with variable pre- and
> post-increments/decrements in the output redirection file path,
> specifically on external executables (not builtins or functions), the state
> of the variable being incremented/decremented is not persisted in the
> environment.

The redirection is expanded in the environment of the command. In the
second case, that means the child process forked to run /bin/true.

``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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