title: Using crontab to execute script between 17:00–20:00 for every 10 minutes
body: <p>I want to send emails to clients every day <strong>between 17:00 to 20:00.</strong> I want to run my command <strong>every 10 minutes in this period.</strong>
  So the script will be executed 6 times per hour. That's a total of 18 times.</p>
  
  <p>Is this possible with the crontab? How should I write the syntax?</p>