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<a name="Implementation-Differences"></a>
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<p>
Previous: <a href="Additional-Lua-Functions.html#Additional-Lua-Functions" accesskey="p" rel="prev">Additional Lua Functions</a>, Up: <a href="Lua-Reference.html#Lua-Reference" accesskey="u" rel="up">Lua Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Implementation-Differences-1"></a>
<h3 class="section">6.3 Implementation Differences</h3>

<p>This section documents disabled and overwritten functions from the standard
Lua libraries.
</p>
<dl compact="compact">
<dt><code>print, io.write</code>
<a name="index-print_002c-io_002ewrite"></a>
</dt>
<dd>
<p>Both functions are overwritten to print to standard error (instead of
standard output), formatted as monotone progress message with the prefix
&quot;lua:&quot; in front of every line.
</p>
<p>The rationale behind this is to catch most of the informational
messages from hooks which use these functions and present them via
monotone&rsquo;s user interface. This allows them to be logged just as other
progress messages, and prevents unexpected out-of-band output in the
<a href="Automation.html#Automation">Automation</a> interface.
</p>
<p>If you explicitly need to write to either stdout or stderr, please use
<code>io.stdout:write</code> and <code>io.stderr.write</code>.
</p>
</dd>
<dt><code>os.execute, io.popen</code>
<a name="index-os_002eexecute_002c-io_002epopen"></a>
</dt>
<dd>
<p>Both functions have been disabled for security reasons. You should use
their replacements <code>spawn</code> and <code>spawn_pipe</code>.
</p>
<p>The original versions do not apply any kind of shell character escaping,
which might lead to serious problems f.e. when a merger is automatically
invoked by such a function.
</p>
</dd>
</dl>





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