title: Crontab, scheduled jobs, on holidays
body: <p>I wrote  a shell script for monitoring a Rest API, when it is down the shell script send two mails one for the developer and the other for the manager. The problem is that I need to this with this frequency:</p>
  
  <ul>
  <li><p>Runs every 15 min during office hours (9-18 hours) during working days and send mail to manager and developer</p></li>
  <li><p>Every hour 6-9 pm and from 18 to 24h on working days runs and sends mail to manager.</p></li>
  <li><p>Runs every 3 hours from 00:00 to 6:00 every night and the holidays and send mail to manager</p></li>
  </ul>
  
  <p>¿How can I discard between holidays and work days? </p>