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Date:      Mon, 20 Jul 2009 07:02:46 -0400
From:      Lowell Gilbert <freebsd-stable-local@be-well.ilk.org>
To:        Glen Barber <glen.j.barber@gmail.com>
Cc:        stable@freebsd.org
Subject:   Re: Shell execution ( [was] Re: Value of $? lost in the beginning of a function.)
Message-ID:  <44tz17k46h.fsf@lowell-desk.lan>
In-Reply-To: <4ad871310907191717g1ed90be7y92250f2addc38d43@mail.gmail.com> (Glen Barber's message of "Sun\, 19 Jul 2009 20\:17\:22 -0400")
References:  <4ad871310907191717g1ed90be7y92250f2addc38d43@mail.gmail.com>

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Glen Barber <glen.j.barber@gmail.com> writes:

> Possibly off-topic...
>
>
> 2009/7/19 Glen Barber <glen.j.barber@gmail.com>:
>> 2009/7/19 Romain Tarti=E8re <romain@blogreen.org>:
>>> Hi Glen,
>>>
>>> On Sun, Jul 19, 2009 at 04:32:28PM -0400, Glen Barber wrote:
>>>> > % sh foo.sh
>>>> > % zsh foo.sh
>>>> > % bash foo.sh
>>>> What happens if you replace '#!/bin/sh' with '#!/usr/local/bin/zsh' ?
>>>
>>> This is not related to my problem since I am not running the script
>>> using ./foo.sh but directly using the proper shell. =A0sh just behaves
>>> differently, that looks odd so I would like to know if it is a bug in sh
>>> or if there is no specification for this and the behaviour depends of
>>> the implementation of each shell, in which case I have to tweak the
>>> script I am porting to avoid this construct (passing $? as an argument
>>> for example).
>>>
>>> Romain
>>>
>>
>> My understanding was this:
>>
>> If you specify 'sh foo.sh' at the shell, the script will be run in a
>> /bin/sh shell, _unless_ you override the shell _in_ the script.
>>
>> Ie, 'sh foo.sh' containing '#!/bin/sh' being redundant, but 'zsh
>> foo.sh' containing '#!/bin/sh' would execute using zsh.
>>
>>
>
> I meant to say in the last line: "'#!/bin/sh' would override the 'zsh' sh=
ell."
>
> Can someone enlighten me if I am wrong about this?

The person to whom you were responding had it closer.

The shell specified in the "#!" first line is only consulted if you run
it as "./foo.sh".  Otherwise, it's input to the shell that you started,
and the line is only a comment.



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