title: "echo" output different answer by sh and bash
body: <p>I ran my script using three ways and the output was different, could you explain to me why it works like that? Thanks!!
  Here is my script</p>
  
  <pre><code>#!/bin/bash
  #Program:
  #     This program shows "Hello World!" in your screen.
  echo -e "Hello World! \a\n" 
  exit 0
  </code></pre>
  
  <p>And if i run it by bash and ./ like <strong>bash sh01.sh</strong> the output is </p>
  
  <blockquote>
    <p>Hello World!</p>
  </blockquote>
  
  <p>However, if i use sh like <strong>sh sh01.sh</strong> it would be like </p>
  
  <blockquote>
    <p>-e Hello World!</p>
  </blockquote>
  
  <p>And Here is some other information</p>
  
  <ol>
  <li>OS: Ubuntu 16.04.3 </li>
  <li>type sh -> dash</li>
  </ol>