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ANACRONTAB(5) Anacron Users' Manual ANACRONTAB(5)

NAME
/etc/anacrontab - configuration file for Anacron

DESCRIPTION
The /etc/anacrontab configuration file describes the jobs controlled by anacron(8). It can contain three types of lines:
job-description lines, environment assignments, or empty lines.

Job-description lines can have the following format:

period in days delay in minutes job-identifier command

The period in days variable specifies the frequency of execution of a job in days. This variable can be represented by
an integer or a macro (@daily, @weekly, @monthly), where @daily denotes the same value as the integer 1, @weekly the same
as 7, and @monthly specifies that the job is run once a month, independent on the length of the month.

The delay in minutes variable specifies the number of minutes anacron waits, if necessary, before executing a job. This
variable is represented by an integer where 0 means no delay.

The job-identifier variable specifies a unique name of a job which is used in the log files.

The command variable specifies the command to execute. The command can either be a command such as ls /proc >> /tmp/proc
or a command to execute a custom script.

Environment assignment lines can have the following format:

VAR=VALUE

Any spaces around VAR are removed. No spaces around VALUE are allowed (unless you want them to be part of the value).
The specified assignment takes effect from the next line until the end of the file, or to the next assignment of the same
variable.

The START_HOURS_RANGE variable defines an interval (in hours) when scheduled jobs can be run. In case this time interval
is missed, for example, due to a power down, then scheduled jobs are not executed that day.

The RANDOM_DELAY variable denotes the maximum number of minutes that will be added to the delay in minutes variable which
is specified for each job. A RANDOM_DELAY set to 12 would therefore add, randomly, between 0 and 12 minutes to the delay
in minutes for each job in that particular anacrontab. When set to 0, no random delay is added.

Empty lines are either blank lines, line containing white spaces only, or lines with white spaces followed by a '#' fol-
lowed by an arbitrary comment.

You can continue a line onto the next line by adding a '\' at the end of it.

In case you want to disable Anacron, add the 0anacron cron job (which is a part of crontabs(4)) into the
/etc/cron.hourly/jobs.deny directory.

EXAMPLE
This example shows how to set up an Anacron job similar in functionality to /etc/crontab which starts all regular jobs
between 6:00 and 8:00 only. A RANDOM_DELAY which can be 30 minutes at the most is specified. Jobs will run serialized
in a queue where each job is started only after the previous one is finished.
# environment variables
SHELL=/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
RANDOM_DELAY=30
# Anacron jobs will start between 6am and 8am.
START_HOURS_RANGE=6-8
# delay will be 5 minutes + RANDOM_DELAY for cron.daily
1 5 cron.daily nice run-parts /etc/cron.daily
7 0 cron.weekly nice run-parts /etc/cron.weekly
@monthly 0 cron.monthly nice run-parts /etc/cron.monthly