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Re: Possible getopts bug


From: Chet Ramey
Subject: Re: Possible getopts bug
Date: Mon, 26 Nov 2001 14:30:16 -0500

> $ cat bashbug2
> #!/bin/bash
> 
> set -- -ab arg1
> echo -e "Initial Value of OPTIND: $OPTIND\n"
> while getopts ab optname
> do
>   echo "Option: $optname      OPTIND: $OPTIND"
> done
> ./bashbug2
> Initial Value of OPTIND: 1
> 
> Option: a     OPTIND: 1
> Option: b     OPTIND: 2
> $
> 
> Notice in the above that, for purposes of incrementing OPTIND,
> getopts seems to improperly treat the two options as a single
> option.  Put differently, it would seem that the value placed
> into OPTIND shouldn't depend on whether options are combined
> following a single introductory - or expressed separately.  Am
> I missing something?

This is correct behavior.

First, getopts is not treating the two options as one: it returns both
options separately.  I don't think there is any argument here. 

OPTIND is supposed to be the index (into $@, essentially) of the
argument getopts is processing.  After parsing option a, getopts
is still working on $1, so OPTIND is still set to 1.  After it
parses b, it moves on to $2 (`arg1'), and sets OPTIND appropriately.

OPTIND is not supposed to be a count of the number of single-
character options that getopts has returned; if you want that
count, you must maintain it yourself.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)

Chet Ramey, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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