Execute command with prompt YES input

Question

 public static String executeCommand(String command) {
    StringBuffer sb = new StringBuffer();
    Process p;
    try {
      p = Runtime.getRuntime().exec(command);
      p.waitFor();
     }   BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
      String line = "";
      while ((line = reader.readLine()) != null) {
        sb.append(line + "\n");
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return sb.toString();
}

given code is working fine to execute any command but I have a command which want YES/NO as input. How I can give the input to command for further execution?

ex.

executeCommand("pio app data-delete model");

output-
[INFO] [App$] Data of the following app (default channel only) will be deleted. Are you sure?
[INFO] [App$]     App Name: twittermodeling
[INFO] [App$]       App ID: 14
[INFO] [App$]  Description: None
Enter 'YES' to proceed:

So How I can give YES to them for further execution.

Thanks

Germiston

Can you give us an example like for an input string the expected behavior? – Gherardo

If I get it...you want to use the value returned by p.waitFor() to say give a prompt Enter 'YES' to proceed:. – Gherardo

Answer 1

If you really need to pass "YES" to an unix command, you could prefix it by echo YES |. echo YES | pio app data-delete model should force deletion.

In the context of runtime.exec() thought the pipe can't be evaluated correctly, refer to this post for more information.

However, the first thing you should do is check if the pio command does not have a "force" flag, usually -f, which would omit user interactions.

Corsage

It is working fine on terminal but when I execute this command echo YES | pio app data-delete model in java , its not worked – Germiston

I think it is due to pipeline character | – Germiston

let me check, there might be a way to use runtime.exec() with composed commands. – Corsage

done, for your information - #5928725 – Germiston

According to this post, you should either put the command in a script and execute it instead, or call a shell environment and pass it the command – Corsage

Answer 2

Do it like this:

line = reader.readLine();

if (line.toLowerCase().equals("yes")){
    ....
}
else if (line.toLowerCase().equals("no")){
    ....
}
else {
    ...
}

Collete

I want to provide Yes or No as input so it can further execute the command. Command is not give YES or NO – Germiston

please give us some more info in your question – Collete