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Re: [Help-bash] Editing a running bash script can cause it fail?

From: Pierre Gaston
Subject: Re: [Help-bash] Editing a running bash script can cause it fail?
Date: Mon, 27 May 2013 09:10:10 +0300

On Mon, May 27, 2013 at 5:59 AM, Chris Down <address@hidden> wrote:
> I'm not totally sure how it happens or what the conditions for re-reading
> the script are, but it is known[1].
> PS (to Chet, et al): is this documented in detail somewhere? This seems like
> one of the few things that I've not been able to find functional
> documentation on, whether in the bash manuals, or elsewhere.
> 1:
> On 27 May 2013 10:54, Peng Yu <address@hidden> wrote:
>> Hi,
>> It seems that a bash script is not first load into memory completely
>> and then get run. Is it the case? I think that this is true because
>> modifying a running bash script sometimes causes the existing run of
>> the script fail.
>> If so, is there a way to let bash read a script completely before
>> running it so that editing the script will not cause the run fail?
>> Thanks.
>> --
>> Regards,
>> Peng

I don't think it's really known. IIRC ksh93 reads the whole file while
bash does not (though on small script it might appear as if it does)

In any case I would not rely on editing a script while it's running.

If the goals is to replace a running script, you can safely* remove
the original file and replace it with a new file.
The script will continue to use the old script file until it exits, if
I'm not mistaken bash doesn't reopen the script file multiple times.

* of course you should take into account what happens if the new file
cannot be copied for some reason

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