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Re: AW: Built-in `test -a` returns incorrectly
From: |
Chet Ramey |
Subject: |
Re: AW: Built-in `test -a` returns incorrectly |
Date: |
Tue, 19 Nov 2024 09:24:25 -0500 |
User-agent: |
Mozilla Thunderbird |
On 11/19/24 2:31 AM, Klüver, Tibor wrote:
Hi,
thank you both for the detailed explanation. I had fully forgotten about the binary meaning of -a. However, it makes me wonder why this isn't more visibly documented.
The current devel branch man page says this:
The historical operator-precedence parsing with 4 or more argu-
ments can lead to ambiguities when it encounters strings that
look like primaries. The POSIX standard has deprecated the -a
and -o primaries and enclosing expressions within parentheses.
Scripts should no longer use them. It's much more reliable to
restrict test invocations to a single primary, and to replace
uses of -a and -o with the shell's && and || list operators.
--
``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/