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OPTIND in ksh script

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# 1  
Old 04-22-2011
OPTIND in ksh script
I have a script that uses this command in a ksh script "shift OPTIND-1". When running this script, I am getting this error "shift: OPTIND-1: numeric argument required".

I am using ksh on Red Hat 5. Is OPTIND not supported on RHEL5 or should I use a different variable in place of OPTIND.

Thanks for your help.
# 2  
Old 04-22-2011
Hi.

OPTIND is used by getopts. Why would you be using it like this?

As a shell variable, it seems to be set to 1 (for what purpose I don't know!), so 1 minus 1 equals 0:

Code:
$ cat myscript
shift $((${OPTIND}-1))
echo $@

$ ./myscript 1 2 3
1 2 3

# 3  
Old 04-22-2011
Thanks for reply. This is the part of script where it fails:

Code:
while getopts hc:k:M:p opt
do
  case $opt in
    (\?) syntax 1;;
    (h) syntax 0;;
    (c) cpath=$OPTARG;;
    (k) ckey=$OPTARG;;
    (M) makefile=$OPTARG;;
    (p) p_oneline=Y;;
  esac
done
shift OPTIND-1

The script fails at the last line with an error 'shift: OPTIND-1: numeric argument required'. I have set the variable OPTIND to 1 at the prompt.

Last edited by Scott; 04-22-2011 at 06:54 PM.. Reason: Please use code tags
# 4  
Old 04-22-2011
$OPTIND (the variable - with $) contains a number, "OPTIND" (without the $) is just a string.

shift expects a number, so:
Code:
shift $((OPTIND-1))

Last edited by Scott; 04-26-2011 at 05:34 PM..
# 5  
Old 04-22-2011
Thanks. Why the same script works just fine on RHEL3 without OPTIND set to 1? Is there any config file I am missing for ksh to set the values upfront?
# 6  
Old 04-22-2011
Hi.

I don't know how that worked in RHEL 3, or anywhere else.

OPTIND seems to be defaulted to 1, but that's not relevant, since (quote):

Code:
OPTIND The index of the last option argument processed by the getopts built-in command.

I'd be surprised if shift OPTIND-1 worked anywhere, since, as a variable it's value would be accessed as $OPTIND, and as OPTIND (without the $) is a literal string, and shift requires a number.
# 7  
Old 04-25-2011
Thanks scottn.

The same script works just fine on RHEL3 and other UNIX versions and I am also surprised to see why its not running on RHEL5 Smilie

Is there any configuration file or setting that tells 'shift' to treat OPTIND as a variable that you may be aware of?

Thanks again for your help.
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