java shell for executing/coordinating processes?

Question

I know about using Runtime.exec, you pass it a native program to run + arguments. If it\'s a regular program, you can run it directly. If it\'s a shell script, you have to r

Answer 1

Ok, I've worked it out:

Basically, you need to invoke bash with a "-s" and then write the full command string to it.

public class ShellExecutor {

  private String stdinFlag;
  private String shell;

  public ShellExecutor(String shell, String stdinFlag) 
  {
    this.shell = shell;
    this.stdinFlag = stdinFlag;
  }

  public String execute(String cmdLine) throws IOException 
  {
    StringBuilder sb = new StringBuilder();
    Runtime run = Runtime.getRuntime();
    System.out.println(shell);
    Process pr = run.exec(cmdLine);
    BufferedWriter bufWr = new BufferedWriter(
        new OutputStreamWriter(pr.getOutputStream()));
    bufWr.write(cmdLine);
    try 
    {
      pr.waitFor();
} catch (InterruptedException e) {}
    BufferedReader buf = new BufferedReader(
        new InputStreamReader(pr.getInputStream()));
    String line = "";
    while ((line = buf.readLine()) != null) 
    {
        sb.append(line + "\n");
    }
    return sb.toString();
  }
}

Then use it like this:

ShellExecutor excutor = new ShellExecutor("/bin/bash", "-s");
try {
  System.out.println(excutor.execute("ls / | sort -r"));
} catch (IOException e) {
  e.printStackTrace();
}

Obviously, you aught to do something with the error string but this is a working example.