bash: parse number range from command line

gistfile1.sh

#!/bin/bash

xmldebug=0
USAGE="Usage: $0 plateid1 [plateid2 ...]
(plateids can also be a range xxx-yyy)"

if [ "$#" == "0" ]; then
    echo "$USAGE"
    exit 1
fi


classifyplate () {
    plateid=$1
    echo Classifying plateid: $plateid
}

while (( "$#" )); do
    # Set In-File-Separator to '-', so xxx-yyy parses into an array
    IFS='-'
    range=($1)
    unset IFS
    shift

    plateid=${range[0]}
    end=${range[1]:-$plateid}
    #echo start: $plateid, end: $end

    while [ $plateid -le $end ]
    do
        classifyplate $plateid;
        plateid=$[$plateid+1]
    done
    
    
done



exit;