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Groups > gnu.bash.bug > #16679
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| From | Chet Ramey <chet.ramey@case.edu> |
| Newsgroups | gnu.bash.bug |
| Subject | Re: set -u not working as expected |
| Date | Sun, 2 Aug 2020 16:41:32 -0400 |
| Organization | ITS, Case Western Reserve University |
| Lines | 17 |
| Approved | bug-bash@gnu.org |
| Message-ID | <mailman.588.1596400901.2739.bug-bash@gnu.org> (permalink) |
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| To | Lawrence Velázquez <vq@larryv.me>, Kristof Burek <contact@kalvr.net> |
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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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Re: set -u not working as expected Chet Ramey <chet.ramey@case.edu> - 2020-08-02 16:41 -0400
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