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man crontab
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You must specify a value for each field. Except for the command field, these
fields can contain the following:
o A number in the specified range. To run a command in May, specify 5 in the
month field.
o 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.
o 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.
o An * (asterisk), meaning all allowed values. To run a job every hour, specify
an asterisk in the hour field.
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