.TH CRON 8 .SH NAMEcron \- clock daemon.SH SYNOPSIS.B /etc/cron.SH DESCRIPTION.I Cronexecutes commands at specified dates and timesaccording to the instructions in the file/usr/lib/crontab.Since.I cronnever exits,it should only be executed once.This is best done by running.I cronfrom the initializationprocess through the file/etc/rc;see.IR init (8)..PPCrontabconsists of lines of six fields each.The fields are separated by spaces or tabs.The first five are integer patterns tospecify theminute (0-59),hour (0-23),day of the month (1-31),month of the year (1-12),and day of the week (1-7 with 1=monday).Each of these patterns maycontain a number in the range above;two numbers separated bya minusmeaning a range inclusive;a list of numbers separated bycommas meaning any of the numbers;or an asterisk meaning all legal values.The sixth field is a stringthat is executed by the Shell at thespecified times.A percent characterin this field is translated to a new-linecharacter.Only the first line (up to a % or end of line)of the command field is executed by the Shell.The other lines are made available to thecommand as standard input..PPCrontab is examined by.I cronevery minute..SH FILES/usr/lib/crontab