Re: Assignment-like word shouldn't be subjected to tilde expansion in POSIX mode

From	Chet Ramey <chet.ramey@case.edu>
Newsgroups	gnu.bash.bug
Subject	Re: Assignment-like word shouldn't be subjected to tilde expansion in POSIX mode
Date	2020-07-19 15:21 -0400
Organization	ITS, Case Western Reserve University
Message-ID	<mailman.143.1595186476.24492.bug-bash@gnu.org> (permalink)
References	<CAH7i3LqG=mnoiSbetxVdg3wqso5orGgMqQk70-UfJ=wcdf6uLQ@mail.gmail.com> <8ddc4816-f85e-97b3-5c51-9b55acdcaca5@case.edu> <CAH7i3LpXfj3p5tXS_4S_dxdvdLG_tNyBa-4bU=z0Xih1=Tr7OA@mail.gmail.com> <5f066ef0-1fed-ad5b-d564-490268d32427@case.edu>

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On 7/19/20 1:47 AM, Oğuz wrote:
> By the way,
> wouldn't it be better if the same tilde expansion rules as with assignment
> statements was applied to parameter expansions that assign default values?
> Like,
> 
>     unset foo
>     echo ${foo=~:~otheruser}
> 
> assigns `/home/oguz:~otheruser' to `foo' regardless of whether `otheruser'
> is a valid login name for an existing user. 

Maybe, but Posix says this isn't a variable assignment context, as POSIX
defines variable assignments, and technically  the shell shouldn't perform
tilde expansions after `=' or `:' at all. You could argue that bash has a
bug here in that it expands the tilde after the `='.

-- 
``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: Assignment-like word shouldn't be subjected to tilde expansion in POSIX mode Chet Ramey <chet.ramey@case.edu> - 2020-07-19 15:21 -0400

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