#!/usr/bin/somesh  ex. ksh, bash, dash, ...
PRG=$0

#####################
usage()
{
     exitid=$1
     [ "$exitid" = "" ] && exitid=1

     echo " Usage: $PRG -f filename [ -d 0-9 ] [-v ] files" >&2
     echo " or  $PRG --filename filename [ --debug 0-9 ] [--verbose ] files" >&2
     exit $exitid
}

#####################
# set default 
filename=""
verbose=0
debug=0

# parse options: look 1st and shift it, if option need argument then double shift
while [ $# -gt 0 ]
do
        opt="$1"
        case "$opt" in
                -v|--verbose)  verbose=1              ;;
                -d|--debug)    debug="$2" ; shift    ;;
                -f|--filename) filename="$2" ; shift  ;;
                --)   shift; break ;; # options end
                -*)   usage 1 ;;  # unknown option
                *)    break ;;  # arguments ...
        esac
        shift # next option
done

# current status in args :  $* include arguments

# test parameters and if some problem: usage including exit
[ "$filename" = "" ] && usage 2
[ "$debug"    = "" ] && usage 3   # debug value can't be empty
[ "$#"       -lt 1   ] && usage 4   # no argument files

# OK, do it
#  use arguments ex. using for
for arg in $*
do
        echo "arg:$arg"
done