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  <section id="alternative-versions-of-an-interface-update-alternatives-from-old-packaging-manual">
<h1><span class="section-number">6. </span>Alternative versions of an interface - <code class="docutils literal notranslate"><span class="pre">update-alternatives</span></code> (from old Packaging Manual)<a class="headerlink" href="#alternative-versions-of-an-interface-update-alternatives-from-old-packaging-manual" title="Permalink to this headline">¶</a></h1>
<p>When several packages all provide different versions of the same program
or file it is useful to have the system select a default, but to allow
the system administrator to change it and have their decisions
respected.</p>
<p>For example, there are several versions of the <code class="docutils literal notranslate"><span class="pre">vi</span></code> editor, and there
is no reason to prevent all of them from being installed at once, each
under their own name (<code class="docutils literal notranslate"><span class="pre">nvi</span></code>, <code class="docutils literal notranslate"><span class="pre">vim</span></code> or whatever). Nevertheless it is
desirable to have the name <code class="docutils literal notranslate"><span class="pre">vi</span></code> refer to something, at least by
default.</p>
<p>If all the packages involved cooperate, this can be done with
<code class="docutils literal notranslate"><span class="pre">update-alternatives</span></code>.</p>
<p>Each package provides its own version under its own name, and calls
<code class="docutils literal notranslate"><span class="pre">update-alternatives</span></code> in its postinst to register its version (and
again in its prerm to deregister it).</p>
<p>See the <em class="manpage">update-alternatives(8)</em> man page for details.</p>
<p>If <code class="docutils literal notranslate"><span class="pre">update-alternatives</span></code> does not seem appropriate you may wish to
consider using diversions instead.</p>
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