bug-bash
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: updating shopt compat settings to include current version


From: Chet Ramey
Subject: Re: updating shopt compat settings to include current version
Date: Wed, 21 Oct 2015 09:21:25 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 10/20/15 2:49 PM, Mike Frysinger wrote:

>>>> I mean, in theory, it's simple to do that:
>>>>
>>>> unset BASH_COMPAT
>>>> shopt -u compat31
>>>> command shopt -s compat32 2>/dev/null
>>>
>>> ... but that doesn't work in bash-3.2:
>>> $ bash-3.2 -c 'shopt -s compat32'
>>> bash-3.2: line 0: shopt: compat32: invalid shell option name
>>
>> No, it really does.  That's why I redirected the output to /dev/null.  I
f
>> you run with `set -e' enabled, you can follow it with `|| :'.
>>
>> Running those commands leaves shell_compatibility_level == 32 on all
>> existing versions of bash >= bash-3.2.   The trick is that on bash-3.2,
>> unsetting compat31 sets the shell compatibility level to 32, so the
>> failed attempt to set compat32 doesn't make a difference.
> 
> my point was to have a code snippet that works for any bash version and a
> shifting base.  we've established that you aren't interested in adding mo
re
> compat flags, and that BASH_COMPAT is not useful for error checking.  fin
e,
> we'll just add some ad-hoc checks ourselves using the existing bash versi
on
> variables.  that isn't supposed to sound petulant, just accepting of the
> reality of the situation.

I don't think you're petulant.  I gave you the code snippet you wanted.
You can use whatever you'd like.

- -- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2

iEUEARECAAYFAlYnkUcACgkQu1hp8GTqdKvFyACXSeoqrLQ/vBFWEWRvTnMCNIcA
IwCfT7JtZUOxc+y/PWCSa5rUMJzubg0=
=W03D
-----END PGP SIGNATURE-----



reply via email to

[Prev in Thread] Current Thread [Next in Thread]