title: Shell script to find cpu utilization using SAR command and send email if usage is more than 75 percent
body: <pre><code>13:30:01          CPU     %user     %nice   %system   %iowait    %steal     %idle
  13:40:01          all      0.56      1.21      0.69      1.64      0.00     95.89
  Average:          all      0.63      1.25     11.10      7.48      0.00     79.55
  </code></pre>
  
  <p>Here is the output of sar command. I want to add the %user and %system from the average and if its more than 75 percent send an email to user. please help and also please let me know if there is any better method to calculate cpu usage. </p>