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CRON(8) System Manager's Manual CRON(8) NAME cron - clock daemon SYNOPSIS /etc/cron DESCRIPTION Cron executes commands at specified dates and times according to the instructions in the file It should be run once from rc(8). Crontab entries are lines of seven fields separated by blanks or tabs: login minute hour day month weekday command Login is the login name under whose userid and groupid the command should be executed. The next five fields are integer patterns for minute 0-59 hour 0-23 day of month 1-31 month of year 1-12 day of week 0-6; 0=Sunday Each pattern may contain a number in the range above; two numbers sepa- rated by a hyphen meaning an inclusive range; a list of numbers sepa- rated by commas meaning any of the numbers; or an asterisk meaning all legal values. The last field is a string to be executed by the shell, after replacing with newline. It is wise to spread the times of activities to avoid bogging the sys- tem down at favorite hours. Cron examines crontab every minute. EXAMPLES daemon 17 3 * * * /usr/bin/calendar - # reminders at 0317 adm 15 4 1,15 * * ac -p | mail adm # bimonthly accounts root 0 12 22-28 11 4 /etc/wall Time for Thanksgiving dinner FILES SEE ALSO at(1) BUGS The behavior of in crontab entries is nonstandard. Strings following should be delivered to the command as standard input. CRON(8)