#! /bin/bash

case "$1" in
    foo )
	echo "foo"
	;;
esac


case "$1" in
'foo' )
	echo "foo"
	;;
esac

case "$1" in
"foo" )
	echo "foo"
	;;
esac

case "$1" in
\[ )
echo "foo"
;;
esac

case "$1" in
\] )
echo "foo"
;;
esac

case "$1" in
    foo\[ )
    echo "foo"
    ;;
esac