Thread: Java Child process cannot execute properly for telnet command

Dear Forum members,

Can you please check below code. It doesn't prompt for telnet when I try to execute telnet command. I need to make an alternative shell where user can execute any command. please help.

import java.io.*;
 
	public class MyShell
	{
	 public static void main(String[] args) throws java.io.IOException {
	  String commandLine;
 
 
	 String command[] = new String[1000];
	  BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
 
 
	while (true) {
 
	  System.out.print("banglalink#");
	  commandLine = console.readLine();
	  System.out.println(commandLine);
 
	  if (commandLine.equals(""))
	    continue;
 
	 command = commandLine.split(" ");
 
	 System.out.println(command[0]);
	// System.out.println(command[1]);
 
 
	  String s = "";	  
	  try {  
	  ProcessBuilder pb=new ProcessBuilder(command); 
	  Process pr=pb.start();
 
	  pr.waitFor(); 
 
    int rc=pr.exitValue();
	System.out.println(rc);
 
 
	  if (pr.exitValue()==0) {  
      BufferedReader outReader=new BufferedReader(new InputStreamReader(pr.getInputStream()));  
     System.out.println("Here is the standard output of the command:\n");
            while ((s = outReader.readLine()) != null) {
                System.out.println(s);
            }
 
 
    } else if (pr.exitValue()== -1)  {  
      System.out.println("Error while getting PID");  
   //   return "";  
    }  else{ pr.waitFor();}
 
 
 
 
 
} catch (Exception e) {
e.printStackTrace();
} 
 
	  }
	 }
	}