How can I run my own personalized bash shell in Java?

My goal is to execute a personalized prompt in a bash shell in linux and to execute orders.
The result should be like in the image.

So I suppose I should start with something like:

ProcessBuilder builder = new ProcessBuilder();
builder.command("sh");
builder.directory(new File(System.getProperty("user.home")));
Process process = builder.start();

or

String homeDirectory = System.getProperty("user.home");
Process process;
try {
    System.out.print("# MyShell> ");
    process = Runtime.getRuntime().exec(String.format("sh", homeDirectory));
} catch (IOException e) {
    System.err.println("Error en el método exec()");
    e.printStackTrace();
}

Controlling the exceptions.

So basically is to start a personalized functional bash prompt in java and control the error messages (like changing its color).
Also controlling the exit with a personalized word, like 'quit' instead of 'exit'.

Note: I am not trying to execute a script or some commands like 'tree' or 'ls' like in many other examples around here. I'm looking for a way to run my personalized bash and do everything that the system allows me in bash or close to this idea.

This problem is more complex than it appears due to the interplay of the shell, the terminal, and your program.

Given that the requirements are:

1. Custom shell prompt
2. Custom commands
3. Have the shell work normally
4. Intercept the program output

My suggestion is:

1. Do the customizations from the shell side
2. Create a pty to fool programs into thinking they're writing to a terminal. In Java on Linux/Mac, a simple way to do this is via the script tool.

Here's an example shell configuration file myrc:

export PS1='# MyShell> '
quit() { exit "$@"; }

and here's Shell.java to start the custom shell:

import java.io.*;
import java.nio.charset.*;
import java.lang.ProcessBuilder.Redirect;

class Shell {
  public static void main(String[] args) throws IOException {
    ProcessBuilder builder = new ProcessBuilder(
        // Use 'script' to fool programs into thinking stdout is a tty.
        "script", "-q", "/dev/null",
        // Run bash with prompt and command customizations
        "bash", "--rcfile", "myrc"
        );
    builder
      // Get input from the current TTY
      .redirectInput(Redirect.INHERIT)
      // But pipe stdout/stderr to intercept it
      .redirectErrorStream(true)
      .redirectOutput(Redirect.PIPE);

    Process proc = builder.start();
    InputStream input = proc.getInputStream();
    byte[] buffer = new byte[65536];
    int read;

    String search = "world";

    while((read = input.read(buffer, 0, buffer.length)) != -1) {
      // Simplify by assuming we only get text data, and only
      // in buffers large enough to contain the entire search string
      String s = new String(buffer, 0, read, StandardCharsets.UTF_8);
      // Replace search word with a highlighted/colored string.
      s = s.replaceAll(search, "\u001B[35m<<$0>>\u001B[m");
      System.out.print(s);
    }

    System.out.println("Java program is exiting...");
  }
}

Example session showing custom prompt, working text interception (making the word "world" purple and surrounded by angle brackets), and finally the custom quit command:

$ javac Shell.java && java Shell
# MyShell> echo "hello world"
hello <<world>>
# MyShell> quit
exit
Java program is exiting...
$