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Annotation of researchv10dc/man/adm/man8/cron.8, revision 1.1.1.1

1.1       root        1: .TH CRON 8
                      2: .CT 1 sa_auto
                      3: .SH NAME
                      4: cron \- clock daemon
                      5: .SH SYNOPSIS
                      6: .B /etc/cron
                      7: .SH DESCRIPTION
                      8: .I Cron
                      9: executes commands at specified dates and times
                     10: according to the instructions in the file
                     11: .FR /etc/crontab .
                     12: It should be run once from
                     13: .IR rc (8).
                     14: .PP
                     15: .I Crontab
                     16: entries are lines of seven fields separated by blanks or tabs:
                     17: .IP
                     18: .I
                     19: login minute hour day month weekday command
                     20: .PP
                     21: .I Login
                     22: is the login name under
                     23: whose userid and groupid
                     24: the command should be executed.
                     25: The next five fields are integer patterns for
                     26: .PD0
                     27: .RS
                     28: .TP \w'day\ of\ month\ \ 'u
                     29: minute
                     30: 0-59
                     31: .TP
                     32: hour
                     33: 0-23
                     34: .TP
                     35: day of month
                     36: 1-31
                     37: .TP
                     38: month of year
                     39: 1-12
                     40: .TP
                     41: day of week
                     42: 0-6; 0=Sunday
                     43: .PD
                     44: .RE
                     45: .PP
                     46: Each pattern may
                     47: contain a number in the range above;
                     48: two numbers separated by
                     49: a hyphen
                     50: meaning an inclusive range;
                     51: a list of numbers separated by
                     52: commas meaning any of the numbers;
                     53: or an asterisk meaning all legal values.
                     54: .PP
                     55: The last field is a string
                     56: to be executed by the shell,
                     57: after replacing
                     58: .L %
                     59: with newline.
                     60: Only the first line
                     61: (up to a
                     62: .L %
                     63: or end of line)
                     64: of the command field is executed by the shell.
                     65: The other lines are made available to the
                     66: command as standard input.
                     67: .PP
                     68: It is wise to spread the times of activities to avoid
                     69: bogging the system down at favorite hours.
                     70: .PP
                     71: .I Cron
                     72: examines
                     73: .I crontab
                     74: every minute.
                     75: .SH EXAMPLES
                     76: .EX
                     77: daemon 17 3  *     *  *   /usr/bin/calendar - # reminders at 0317
                     78: adm    15 4  1,15  *  *   ac -p | mail adm # bimonthly accounts
                     79: daemon 0  12 22-28 11 4   mail turkey % time's up: thanksgiving dinner
                     80: .EE
                     81: .SH FILES
                     82: .F /etc/crontab

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