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Re: getting weird output out of 'echo' w/args


From: Pierre Gaston
Subject: Re: getting weird output out of 'echo' w/args
Date: Thu, 30 May 2013 12:07:42 +0300

On Thu, May 30, 2013 at 12:04 PM, Davide Brini <address@hidden> wrote:
> On Thu, 30 May 2013 16:56:36 +0800, Chris Down <address@hidden> wrote:
>
>> Pierre is referring to the fact that [i++] is evaluated as a glob by
>> the shell, the reason it doesn't work is because $i is postincremented
>> instead of preincremented. You can see what he means here:
>>
>> $ shopt -u nullglob
>> $ i=0
>> $ while read a[++i]; do
>> >     echo "${a[i]}"
>> > done <<< hello
>> hello
>> $ shopt -s nullglob
>> $ while read a[++i]; do
>> >     echo "${a[i]}"
>> > done <<< hello
>>
>> $
>
> But he was doing postincrement, so it wouldn't have worked anyway, since
> the code was assigning to a[0] and printing a[1].
>
> PS: Better put a
>
> a=()
>
> before each run.
>
> --
> D.

ok sorry for not having try my example, my point  is that it was not
assigning to a[0] because of the nullglob and that this one can be
hard to spot



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