How to run a shell script inside an Android app?

Question

I am trying to write an Android app for root users that runs a series of shell commands or a shell script, if preferred, and displays the output ... can someone point me in the right direction?

Answer 1

This fragment requires root access, but it will execute the given string as a shell command

void execCommandLine(String command)
{
    Runtime runtime = Runtime.getRuntime();
    Process proc = null;
    OutputStreamWriter osw = null;

    try
    {
        proc = runtime.exec("su");
        osw = new OutputStreamWriter(proc.getOutputStream());
        osw.write(command);
        osw.flush();
        osw.close();
    }
    catch (IOException ex)
    {
        Log.e("execCommandLine()", "Command resulted in an IO Exception: " + command);
        return;
    }
    finally
    {
        if (osw != null)
        {
            try
            {
                osw.close();
            }
            catch (IOException e){}
        }
    }

    try 
    {
        proc.waitFor();
    }
    catch (InterruptedException e){}

    if (proc.exitValue() != 0)
    {
        Log.e("execCommandLine()", "Command returned error: " + command + "\n  Exit code: " + proc.exitValue());
    }
}