What does the 'DOM' value in a crontab indicate?

The 'DOM' value in a crontab refers to the "Day of the Month." When configuring a cron job, the schedule defines when the job should run based on specific time and date parameters. The 'DOM' field specifically allows users to designate the particular day(s) of a given month on which a command will be executed.

For instance, if a user specifies "15" in the 'DOM' field, the command will execute on the 15th of every month, provided the other time fields are satisfied. The ability to set jobs based on the day of the month is an essential feature for scheduling tasks that need to be performed regularly but only on specific days.

Understanding this helps clarify the structure of a cron schedule, which typically includes minute, hour, day of the month, month, and day of the week fields, each serving distinct purposes in defining execution times.