execute_cmd.java

import java.util.Scanner;
import java.io.*;

class main{

	public static Scanner input = new Scanner(System.in);

	public static String userInput() {
		String user = "";
 		System.out.print(">");
 		user = input.nextLine();
 		return user;
	}

	public static void runCommand(String user_cmd){
		try{
 			Process process = Runtime.getRuntime().exec(user_cmd);
 			printResults(process);
 		}catch(Exception ex){
 			ex.printStackTrace();
 		}
	}
	
	public static void printResults(Process process) throws IOException {
		BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
		String line = "";
		while ((line = reader.readLine()) != null) {
		    System.out.println(line);
		}
	}

 	public static void main(String[] args){ 
 		runCommand(userInput());
 	}
}