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Re: set -u not working as expected

From: Chet Ramey
Subject: Re: set -u not working as expected
Date: Sun, 2 Aug 2020 16:41:32 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 8/1/20 8:47 PM, Lawrence Velázquez wrote:

>> let v+=1 # Line 18, Once line 11 is uncommented, Bash fails here
> I haven't seen the code for arithmetic expansion, but I assume it
> treats v+=1 as morally equivalent to v=${v}+1 (à la C99). Thus there
> *is* an expansion, which fails under set -u. Regardless of the
> particulars, ksh and zsh again agree:

This is indeed what happens in an arithmetic context. It happens with
pre- and post-increment and decrement operators, too.

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

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