.\" Copyright (c) 1986 The Regents of the University of California.
.\" %sccs.include.proprietary.roff%
.\" @(#)cron.8 6.7 (Berkeley) %G%
executes commands at specified dates and times
according to the instructions in the files
/etc/crontab and /etc/crontab.local.
None, either one, or both of these files may be present.
it should only be executed once.
This is best done by running
consist of lines of seven fields each.
The fields are separated by spaces or tabs.
The first five are integer patterns to specify:
day of the week (1-7 with 1 = Monday)
Each of these patterns may contain:
a number in the range above
two numbers separated by a minus
meaning a range inclusive
a list of numbers separated by
commas meaning any of the numbers
an asterisk meaning all legal values
The sixth field is a user name: the
command will be run with that user's uid and permissions.
The seventh field consists of all the text
on a line following the sixth field,
including spaces and tabs;
this text is treated as a command
which is executed by the Shell at the
A percent character (``%'')
in this field is translated to a new-line
crontab files are checked by
every minute, on the minute.