title: system loads in GNU screen's hardstatus line
body: <p>I use screen a lot on my Linux. I wanted to change the hardstatus line a bit.
  I want to add CPU and Memory usage information to the line but I don't know how.
  after some searches in Google all I could find was %l option to add system loads.</p>
  <p>my line (which is copied) looks like this:</p>
  <pre><code>hardstatus alwayslastline '%{= G}[ %{G}%H %{g}][%= %{= w}%?%-Lw%?%{= R}%n*%f %t%?%{= R}(%u)%?%{= w}%+Lw%?%= %{= g}][ %{y}Load: %l %{g}][%{B}%D %d-%    M-%Y %{W}%C:%s %A %{g}]'
  </code></pre>
  <p>and my screen hardstatus line is like this:
  <img src="https://i.stack.imgur.com/tyMjt.png" alt="enter image description here" /></p>
  <p>now what are the three numbers defined ad load ??
  and how can I change them to something like <code>CPU load 28% Mem Load 43%</code> or similar?</p>