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Re: Saving/restoring of posix option unsets expand_aliases

From: Chet Ramey
Subject: Re: Saving/restoring of posix option unsets expand_aliases
Date: Mon, 25 Nov 2019 15:02:13 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.2.2

On 11/24/19 7:35 AM, Ulrich Mueller wrote:
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-gcc
Compilation CFLAGS: -march=native -ggdb -O2 -pipe -Wno-parentheses 
uname output: Linux themis 4.14.154-gentoo #1 SMP Sat Nov 16 15:00:00 CET 2019 
x86_64 Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz GenuineIntel GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.0
Patch Level: 11
Release Status: release

In a non-interactive non-posix-mode shell, saving the output of
"shopt -p -o" and restoring it will unset the expand_aliases option.

It seems like setting posix mode when it's already set, or unsetting it
when it's not, should be a no-op instead of guaranteeing a certain
environment (posix or default). That's easy enough.

There's no question that setting posix mode should change the values of a
number of bash options to produce a compliant environment.

It's a different question whether or not unsetting posix mode should revert
to the settings before posix mode was enabled or restore the default
environment. It's always meant the latter.


``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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