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Re: Tilde expansion during command search


From: Eric Blake
Subject: Re: Tilde expansion during command search
Date: Wed, 23 Jul 2014 08:38:24 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 07/23/2014 08:08 AM, lolilolicon wrote:
> On Wed, Jul 23, 2014 at 9:58 PM, Eric Blake <address@hidden> wrote:
>>
>> Might be worth asking the POSIX folks if it is allowed by POSIX.  What
>> do other shells do?
> 
>>From this page: http://pubs.opengroup.org/onlinepubs/7908799/xcu/chap2.html
> 
>     Note that the tildes are expanded during the assignment to PATH, not
>     when PATH is accessed during command search.

No, it wasn't.  Re-read the original post:

    PATH=\~/tmpdir
    typeset -p PATH

which produced this output:

    declare -x PATH="~/tmpdir"

which proves that ~ was not expanded in the assignment to PATH, but only
in the use of PATH.

I'm strongly in favor of keeping bash's behavior when in bash mode, but
for 'set -o posix', I worry that bash differing from other shells may
mean bash is not compliant with POSIX.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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