temp setting POSIXLY_CORRECT turns alias expansion off

From	Martijn Dekker <martijn@inlv.org>
Newsgroups	gnu.bash.bug
Subject	temp setting POSIXLY_CORRECT turns alias expansion off
Date	2020-01-16 04:24 +0100
Message-ID	<mailman.2684.1579145088.1979.bug-bash@gnu.org> (permalink)
References	<e9ec694f-aba2-1143-aa93-182ec2f85b8d@inlv.org>

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When alias expansion is enabled for a script in bash native mode, 
prefixing POSIXLY_CORRECT=y to any command will turn alias expansion 
globally off. This is a bug because the assignment should only have 
effect on that command.

$ bash -c 'shopt -s expand_aliases; shopt|grep expand_a;
   POSIXLY_CORRECT=y true; shopt|grep expand_a'
expand_aliases 	on
expand_aliases 	off

Expected behaviour: alias expansion should stay on.

I've confirmed this bug on bash 4.2 and later; bash 4.1 and earlier seem 
fine.

- M.

-- 
modernish -- harness the shell
https://github.com/modernish/modernish

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temp setting POSIXLY_CORRECT turns alias expansion off Martijn Dekker <martijn@inlv.org> - 2020-01-16 04:24 +0100

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