txt bob.txt</code></pre>

          <p>This will overwrite the old contents of <code>bob.txt</code> with the contents
            of <code>alice.txt</code>! UNIX won't warn you about overwriting, so be careful
            when using the <code>mv</code> command!</p>
        </blockquote>


        <h3 id="copying-files">Copying files</h3>


        <p>Sometimes, it is useful to have multiple copies of a file. Try the
          following command:</p>

        <pre><code>cp unix_commands.txt new_file.txt</code