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Reply-To: moss AT cs DOT umass DOT edu
Subject: Re: alias appears to not work inside a called bash script
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To: cygwin AT cygwin DOT com
From: Eliot Moss <moss AT cs DOT umass DOT edu>
Message-ID: <637017a5-b774-cb10-f064-065d20e421b3@cs.umass.edu>
Date: Tue, 22 Aug 2017 12:45:55 -0400
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On 8/22/2017 11:18 AM, Stephen John Smoogen wrote:
> On 22 August 2017 at 10:47, Eliot Moss <moss AT cs DOT umass DOT edu> wrote:
>> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:

>> It's a *bash* default - it has nothing to do with Cygwin as distinct
>> from other bash installations.  If you had a different experience
>> elsewhere, it could be that the default was overridden in some system
>> wide bashrc file - but that strikes me as unlikely.  I suspect that
>> this is done as a security measure, to prevent an alias from introducing
>> a surprise.
>>
>
> I checked on CentOS and there is no shopt option set in any of the
> /etc/ files. It must be a compiled in default of some sort as EL6 and
> EL7 both work without an explicit `shopt -s expand_aliases`. I then
> tried on an Ubuntu 16.04 system and it works without the `shopt -s
> expand_aliases` also.
>
> I didn't have access to anything else at the moment so I can't say
> which other systems might actually follow the default other than
> Cygwin at the moment.

Hmmm ... One of my servers runs EL7 and it works there exactly as under
Cygwin on my laptop.  I wonder: Is there an nawk installed somewhere
on your path on these CentOS and EL* systems?  Put another way, if you
put 'type -a nawk' in your script *before* the alias lines, what output
do you get?  And what about shopt?  I added these lines before the alias
lines:

shopt | grep expand_aliases
type -a nawk
type -t nawk

Regards - Eliot

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