title: Linux: How to find man page or different versions of Linux commands?
body: <p>I'm not sure what it's called exactly. But offen in a Linux 'man' page it refers to the same command but a different "version" number. For example:</p>
  
  <pre><code>$ man signal
  </code></pre>
  
  <p>Is SIGNAL(2), but there refers to a SIGNAL(5), for example. I tried this but it doesn't work on Linux CentOS 6:</p>
  
  <pre><code>$ man 5 signal
  No entry for signal in section 5 of the manual
  </code></pre>
  
  <p>How do I find/access the man page for SIGNAL(5)? Thanks!</p>