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1.1       root        1: .TH CRON 8  "4 February 1983"
                      2: .SH NAME
                      3: cron \- clock daemon
                      4: .SH SYNOPSIS
                      5: .B /etc/cron
                      6: .SH DESCRIPTION
                      7: .I Cron
                      8: executes commands at specified dates and times
                      9: according to the instructions in the file
                     10: /usr/lib/crontab.
                     11: Since
                     12: .I cron
                     13: never exits,
                     14: it should only be executed once.
                     15: This is best done by running
                     16: .I cron
                     17: from the initialization
                     18: process through the file
                     19: /etc/rc;
                     20: see
                     21: .IR init (8).
                     22: .PP
                     23: Crontab
                     24: consists of lines of six fields each.
                     25: The fields are separated by spaces or tabs.
                     26: The first five are integer patterns to
                     27: specify the
                     28: minute (0-59),
                     29: hour (0-23),
                     30: day of the month (1-31),
                     31: month of the year (1-12),
                     32: and day of the week (1-7 with 1=Monday).
                     33: Each of these patterns may
                     34: contain a number in the range above;
                     35: two numbers separated by
                     36: a minus
                     37: meaning a range inclusive;
                     38: a list of numbers separated by
                     39: commas meaning any of the numbers;
                     40: or an asterisk meaning all legal values.
                     41: The sixth field is a string
                     42: that is executed by the Shell at the
                     43: specified times.
                     44: A percent character
                     45: in this field is translated to a new-line
                     46: character.
                     47: Only the first line (up to a % or end of line)
                     48: of the command field is executed by the Shell.
                     49: The other lines are made available to the
                     50: command as standard input.
                     51: .PP
                     52: Crontab is examined by
                     53: .I cron
                     54: every minute.
                     55: .SH FILES
                     56: /usr/lib/crontab

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