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Annotation of 43BSDReno/usr.sbin/cron/cron.8, revision 1.1.1.1

1.1       root        1: .\"    @(#)cron.8      6.6 (Berkeley) 6/24/90
                      2: .\"
                      3: .TH CRON 8 "June 24, 1990"
                      4: .AT 3
                      5: .SH NAME
                      6: cron \- clock daemon
                      7: .SH SYNOPSIS
                      8: .B cron
                      9: .SH DESCRIPTION
                     10: .I Cron
                     11: executes commands at specified dates and times
                     12: according to the instructions in the files
                     13: /etc/crontab and /etc/crontab.local.
                     14: None, either one, or both of these files may be present.
                     15: Since
                     16: .I cron
                     17: never exits,
                     18: it should only be executed once.
                     19: This is best done by running
                     20: .I cron
                     21: from the initialization
                     22: process through the file
                     23: /etc/rc;
                     24: see
                     25: .IR init (8).
                     26: .PP
                     27: The
                     28: crontab files
                     29: consist of lines of seven fields each.
                     30: The fields are separated by spaces or tabs.
                     31: The first five are integer patterns to specify:
                     32: .in +2m
                     33: .TP 2m
                     34: \(bu
                     35: minute (0-59)
                     36: .nr .0 \n()Pu
                     37: .nr )P 0
                     38: .TP 2m
                     39: \(bu
                     40: hour (0-23)
                     41: .TP 2m
                     42: \(bu
                     43: day of the month (1-31)
                     44: .TP 2m
                     45: \(bu
                     46: month of the year (1-12)
                     47: .TP 2m
                     48: \(bu
                     49: day of the week (1-7 with 1 = Monday)
                     50: .nr )P \n(.0u
                     51: .in -2m
                     52: .LP
                     53: Each of these patterns may contain:
                     54: .in +2m
                     55: .TP 2m
                     56: \(bu
                     57: a number in the range above
                     58: .nr .0 \n()Pu
                     59: .nr )P 0
                     60: .TP 2m
                     61: \(bu
                     62: two numbers separated by a minus
                     63: meaning a range inclusive
                     64: .TP 2m
                     65: \(bu
                     66: a list of numbers separated by
                     67: commas meaning any of the numbers
                     68: .TP 2m
                     69: \(bu
                     70: an asterisk meaning all legal values
                     71: .nr )P \n(.0u
                     72: .in -2m
                     73: .LP
                     74: The sixth field is a user name: the
                     75: command will be run with that user's uid and permissions.
                     76: The seventh field consists of all the text
                     77: on a line following the sixth field,
                     78: including spaces and tabs;
                     79: this text is treated as a command
                     80: which is executed by the Shell at the
                     81: specified times.
                     82: A percent character (``%'')
                     83: in this field is translated to a new-line
                     84: character.
                     85: .PP
                     86: Both
                     87: crontab files are checked by
                     88: .I cron
                     89: every minute, on the minute.
                     90: .SH FILES
                     91: /etc/crontab
                     92: .br
                     93: /etc/crontab.local

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