Format of crontab

30 18 * * * rm /home/someuser/tmp/*

Fields:

  1. minute (0–59)
  2. hour (0–23)
  3. day of month (1–31)
  4. month (1–12)
  5. day of week (0–6, 0=Sunday)
  6. command

By default cron sends an email to the user account executing the cronjob. If this is not needed, add:

>/dev/null 2>&1

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