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Re: $OPTIND varibale value is different from sh


From: Chet Ramey
Subject: Re: $OPTIND varibale value is different from sh
Date: Wed, 20 Jun 2018 16:03:19 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 6/20/18 2:09 PM, Martijn Dekker wrote:
> Op 20-06-18 om 13:39 schreef Greg Wooledge:
>> I really don't understand what you're doing here, either.  The only
>> use of OPTIND is after the final call to getopts, when there are no
>> more options to process.  At that point, OPTIND tells you how many
>> times you have to "shift" to get rid of all the options that were
>> processed.  (And you have to subtract 1, because legacy historical
>> reasons.)
> 
> In other words, because all the options have now been processed, OPTIND
> points to the first argument *after* the list of options. I don't see how
> that is "because legacy historical reasons". It seems both logical and
> useful to me.

It enables the universal idiom `shift $(( $OPTIND - 1 ))' to throw away
the options and option arguments and deal with the rest of the arguments.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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