Untitled

#!/bin/bash
a=$(echo $QUERY_STRING | cut -d"&" -f1 | cut -d"=" -f2)
b=$(echo $QUERY_STRING | cut -d"&" -f2 | cut -d"=" -f2)

echo "Content-Type: text/html"
echo ""
echo "
<html>
<head>
<title>Document</title>
</head>
<body>
<h1>Hello world!</h1>
<h2>$QUERY_STRING</h2>
<form action='/script' method='GET'>
<input value='$a' name=a type=text>
+
<input value='$b' name=b type=text>
<button>=</button>
$[ a + b ]
</form>
</body>
</html>
"