shift -- for Command Line Options

#!/bin/bash

echo "\$0=$0"
echo "\$1=$1"
echo "\$2=$2"
echo "\$3=$3"
echo "\$#=$#"

interactive=
filename=./test.html

while [ "$1" != "" ]; do
case $1 in
-f | --file )	shift
filename=$1
echo "file  \$1=$1"
echo "filename=$filename"
;;
-i | interactive ) interactive=1
echo "interactive  $interactive"
;;
-h | --help )	echo "help"
usage
exit
;;
* )				echo "other "
usage
exit 1
esac
shift
echo "out case \$1=$1"
done