Shell Programming and Scripting

while [ $# -gt 0 ]
do
   OPTIND=
   while getopts :fvriR opt
   do
      case $opt in
         f)    fopt=1; iopt=0;;
         v)    vopt=1;;
         [Rr]) ropt=1;;
         i)    iopt=1; fopt=0;;
         \?)   invalid_option $OPTARG;;
      esac
   done

   # Move past the option arguments to the file arguments
   shift `expr $OPTIND - 1`

   # Get next file name if present
   if [ $# -ne 0 ]
   then
      filelist="$filelist $1"
      shift
   fi
done

do_whatever $filelist