The syntax for crontab entries consists of five fields that specify the schedule for the job: minute, hour, day of the month, month, and day of the week. Each field can contain a single value, a range of values separated by a hyphen, a comma-separated list of values, or an asterisk to match any value. You can also use some special keywords, such as @reboot to run the job at startup or @daily to run it once per day. For more detailed information on crontab syntax, you can refer to the resources section on our site.