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<a name="rename_002d_002d_002drename-a-file"></a>
<h3 class="section">4.53 <code>rename</code>—rename a file</h3>
<a name="index-rename"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include <stdio.h>
int rename(const char *<var>old</var>, const char *<var>new</var>);
</pre></div>
<p><strong>Description</strong><br>
Use <code>rename</code> to establish a new name (the string at <var>new</var>) for a
file now known by the string at <var>old</var>. After a successful
<code>rename</code>, the file is no longer accessible by the string at <var>old</var>.
</p>
<p>If <code>rename</code> fails, the file named <code>*<var>old</var></code> is unaffected. The
conditions for failure depend on the host operating system.
</p>
<br>
<p><strong>Returns</strong><br>
The result is either <code>0</code> (when successful) or <code>-1</code> (when the file
could not be renamed).
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C requires <code>rename</code>, but only specifies that the result on
failure be nonzero. The effects of using the name of an existing file
as <code>*<var>new</var></code> may vary from one implementation to another.
</p>
<p>Supporting OS subroutines required: <code>link</code>, <code>unlink</code>, or <code>rename</code>.
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