Run Linux command with ProcessBuilder

This example show how to run Linux command in Android app with java.lang.ProcessBuilder.
remark: NOT all Linux commands supported.

Linux command 'ls -s' run in Android app

package com.example.androidruncommand;

import java.io.IOException;
import java.io.InputStream;

import android.os.Bundle;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity {
 
 TextView prompt;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  prompt = (TextView)findViewById(R.id.prompt);
  
  //String[] command = {"df", "-h", "/"};
  //String[] command = {"df"};
  //String[] command = {"ls"};
  String[] command = {"ls", "-s"};
  
  StringBuilder cmdReturn = new StringBuilder();
  
  try {
   ProcessBuilder processBuilder = new ProcessBuilder(command);
   Process process = processBuilder.start();
   
   InputStream inputStream = process.getInputStream();
   int c;
            while ((c = inputStream.read()) != -1) {
                cmdReturn.append((char) c);
            }
            
            prompt.setText(cmdReturn.toString());
            
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/prompt"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </ScrollView>

</LinearLayout>