14.3 Verifying Job
Runs
A crontab file contains entries for each cron job.
Entries are separated by newline characters. Each crontab file entry contains
six fields separated by spaces or tabs in the following form:
minute hour day_of_month month weekday command
These fields accept the following values:
-
minute
- 0 through 59
-
hour
- 0 through 23
-
day_of_month
- 1 through 31
-
month
- 1 through 12
-
weekday
- 0 through 6 for Sunday through Saturday
-
command
- A shell command
You must specify a value for each field. Except for the command field, these
fields can contain the following:
- A number in the specified range. To run a command in May, specify 5 in the
month field.
- Two numbers separated by a dash to indicate an inclusive range. To run a
cron job on Tuesday through Friday, place 2-5 in the weekday field.
- A list of numbers separated by commas. To run a command on the first and
last day of January, you would specify 1,31 in the day_of_month field.
- An * (asterisk), meaning all allowed values. To run a job every hour,
specify an asterisk in the hour field.
14.5 Scheduling
Run