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<ul   class='indexList indexList1'>
  <li class='indexItem indexItem1'><a href='#NAME'>NAME</a>
  <li class='indexItem indexItem1'><a href='#SYNOPSIS'>SYNOPSIS</a>
  <li class='indexItem indexItem1'><a href='#DESCRIPTION'>DESCRIPTION</a>
  <li class='indexItem indexItem1'><a href='#FUNCTIONS'>FUNCTIONS</a>
  <li class='indexItem indexItem1'><a href='#AUTHOR'>AUTHOR</a>
  <li class='indexItem indexItem1'><a href='#SEE_ALSO'>SEE ALSO</a>
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<h1><a class='u' href='#___top' title='click to go to top of document'
name="NAME"
>NAME</a></h1>

<p>Lintian::Relation::Version - Comparison operators on Debian versions</p>

<h1><a class='u' href='#___top' title='click to go to top of document'
name="SYNOPSIS"
>SYNOPSIS</a></h1>

<pre>    print &#34;yes\n&#34; if versions_equal(&#39;1.0&#39;, &#39;1.00&#39;);
    print &#34;yes\n&#34; if versions_gte(&#39;1.1&#39;, &#39;1.0&#39;);
    print &#34;no\n&#34; if versions_lte(&#39;1.1&#39;, &#39;1.0&#39;);
    print &#34;yes\n&#34; if versions_gt(&#39;1.1&#39;, &#39;1.0&#39;);
    print &#34;no\n&#34; if versions_lt(&#39;1.1&#39;, &#39;1.1&#39;);
    print &#34;yes\n&#34; if versions_compare(&#39;1.1&#39;, &#39;&#60;=&#39;, &#39;1.1&#39;);</pre>

<h1><a class='u' href='#___top' title='click to go to top of document'
name="DESCRIPTION"
>DESCRIPTION</a></h1>

<p>This module provides five functions for comparing version numbers. The underlying implementation uses <code>libapt-pkg-perl</code> to ensure that the results match what dpkg will expect.</p>

<h1><a class='u' href='#___top' title='click to go to top of document'
name="FUNCTIONS"
>FUNCTIONS</a></h1>

<dl>
<dt><a name="versions_equal(A,_B)"
>versions_equal(A, B)</a></dt>

<dd>
<p>Returns true if A is equal to B (<code>=</code>) and false otherwise.</p>

<dt><a name="versions_lte(A,_B)"
>versions_lte(A, B)</a></dt>

<dd>
<p>Returns true if A is less than or equal (<code>&#60;=</code>) to B and false otherwise.</p>

<dt><a name="versions_gte(A,_B)"
>versions_gte(A, B)</a></dt>

<dd>
<p>Returns true if A is greater than or equal (<code>&#62;=</code>) to B and false otherwise.</p>

<dt><a name="versions_lt(A,_B)"
>versions_lt(A, B)</a></dt>

<dd>
<p>Returns true if A is less than (<code>&#60;&#60;</code>) B and false otherwise.</p>

<dt><a name="versions_gt(A,_B)"
>versions_gt(A, B)</a></dt>

<dd>
<p>Returns true if A is greater than (<code>&#62;&#62;</code>) B and false otherwise.</p>

<dt><a name="versions_compare(A,_OP,_B)"
>versions_compare(A, OP, B)</a></dt>

<dd>
<p>Returns true if A OP B, where OP is one of <code>=</code>, <code>&#60;=</code>, <code>&#62;=</code>, <code>&#60;&#60;</code>, or <code>&#62;&#62;</code>, and false otherwise.</p>

<dt><a name="versions_comparator_(A,_B)"
>versions_comparator (A, B)</a></dt>

<dd>
<p>Returns -1, 0 or 1 if the version A is (respectively) less than, equal to or greater than B. This is useful for (e.g.) sorting a list of versions:</p>

<pre> foreach my $version (sort versions_comparator @versions) {
    ...
 }</pre>
</dd>
</dl>

<h1><a class='u' href='#___top' title='click to go to top of document'
name="AUTHOR"
>AUTHOR</a></h1>

<p>Originally written by Russ Allbery &#60;rra@debian.org&#62; for Lintian and adapted to use libapt-pkg-perl by Adam D. Barratt &#60;adam@adam-barratt-org.uk&#62;.</p>

<h1><a class='u' href='#___top' title='click to go to top of document'
name="SEE_ALSO"
>SEE ALSO</a></h1>

<p>lintian(1)</p>
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