title: Run an magento function cron at every hour
body: <p>I  want to  run an magento function that would run at every hour , i am written code in config.xml but i did not working.here the code is</p>
  
  <pre><code>&lt;crontab&gt;
              &lt;jobs&gt;
                  &lt;stockalert_autosend&gt;
                  &lt;schedule&gt;&lt;cron_expr&gt;**/1 * * *&lt;/cron_expr&gt;&lt;/schedule&gt;
                  &lt;run&gt;&lt;model&gt;stockalert/observer::backinstock&lt;/model&gt;&lt;/run&gt;
              &lt;/stockalert_autosend&gt;
              &lt;/jobs&gt;
          &lt;/crontab&gt;
  </code></pre>
  
  <p>Please help me</p>