<p>When writing a file, switches to writing a DOS format (CR/LF).
</p>
</dd>
<dt><code>macformat</code></dt>
<dd><p>When writing a file, switches to writing a Mac format.
</p>
</dd>
<dt><code>append</code></dt>
<dd><p>When writing a file, appends to the end instead of overwriting.
</p>
</dd>
<dt><code>prepend</code></dt>
<dd><p>When writing a file, &rsquo;prepends&rsquo; (writes at the beginning) instead of overwriting.
</p>
</dd>
<dt><code>backup</code></dt>
<dd><p>When writing a file, creates a backup of 