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Thread: Java Child process cannot execute properly for telnet command

  1. #1
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    Default 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();
    } 
     
    	  }
    	 }
    	}


  2. #2
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    Default Re: Java Child process cannot execute properly for telnet command

    Did you write this code? What happens when it compiles?
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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