anacron man page on Oracle

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ANACRON(8)		     System Administration		    ANACRON(8)

       anacron - runs commands periodically

       anacron [-s] [-f] [-n] [-d] [-q] [-t anacrontab] [-S spooldir] [job]
       anacron [-S spooldir] -u [-t anacrontab] [job]
       anacron [-V|-h]
       anacron -T [-t anacrontab]

       Anacron	is  used  to  execute  commands periodically, with a frequency
       specified in days.  Unlike cron(8), it does not assume that the machine
       is  running  continuously.   Hence, it can be used on machines that are
       not running 24 hours a day to control regular jobs  as  daily,  weekly,
       and monthly jobs.

       Anacron	reads  a  list	of jobs from the /etc/anacrontab configuration
       file (see anacrontab(5)).  This file contains the  list	of  jobs  that
       Anacron	controls.   Each job entry specifies a period in days, a delay
       in minutes, a unique job identifier, and a shell command.

       For each job, Anacron checks whether this job has been executed in  the
       last  n	days, where n is the time period specified for that job.  If a
       job has not been executed in n days or more,  Anacron  runs  the	 job's
       shell command, after waiting for the number of minutes specified as the
       delay parameter.

       After the command exits, Anacron records the date (excludes  the	 hour)
       in  a  special timestamp file for that job, so it knows when to execute
       that job again.

       When there are no more jobs to be run, Anacron exits.

       Anacron	only  considers	 jobs  whose  identifier,  as	specified   in
       anacrontab(5),  matches any of the job command-line arguments.  The job
       command-line arguments can be represented by  shell  wildcard  patterns
       (be sure to protect them from your shell with adequate quoting).	 Spec‐
       ifying no job command-line arguments is equivalent  to  specifying  "*"
       (that is, all jobs are considered by Anacron).

       Unless Anacron is run with the -d option (specified below), it forks to
       the background when it starts, and any parent  processes	 exit  immedi‐

       Unless Anacron is run with the -s or -n options, it starts jobs immedi‐
       ately when their delay is over.	The execution  of  different  jobs  is
       completely independent.

       If  an executed job generates any output to standard output or to stan‐
       dard error, the output is mailed to the user under whom Anacron is run‐
       ning (usually root), or to the address specified in the MAILTO environ‐
       ment variable in the /etc/anacrontab file, if such exists.  If the LOG‐
       NAME  environment variable is set, it is used in the From: field of the

       Any informative messages generated by Anacron are sent to syslogd(8) or
       rsyslogd(8) under with facility set to cron and priority set to notice.
       Any error messages are sent with the priority error.

       "Active" jobs (i.e., jobs that Anacron already decided to run  and  are
       now  waiting for their delay to pass, and jobs that are currently being
       executed by Anacron), are "locked", so that  other  copies  of  Anacron
       cannot run them at the same time.

       -f     Forces execution of all jobs, ignoring any timestamps.

       -u     Updates the timestamps of all jobs to the current date, but does
	      not run any.

       -s     Serializes execution of jobs.  Anacron does not start a new  job
	      before the previous one finished.

       -n     Runs  jobs  immediately  and ignores the specified delays in the
	      /etc/anacrontab file.  This options implies -s.

       -d     Does not fork Anacron to the background.	In this mode,  Anacron
	      will output informational messages to standard error, as well as
	      to syslog.  The output of any job is mailed by Anacron.

       -q     Suppresses any messages to standard error.  Only applicable with

       -t some_anacrontab
	      Uses  the	 specified anacrontab, rather than the /etc/anacrontab
	      default one.

       -T     Anacrontab testing. Tests the /etc/anacrontab configuration file
	      for  validity.  If there is an error in the file, it is shown on
	      the standard output and Anacron returns the value of  1.	 Valid
	      anacrontabs return the value of 0.

       -S spooldir
	      Uses the specified spooldir to store timestamps in.  This option
	      is required for users who wish to run anacron themselves.

       -V     Prints version information, and exits.

       -h     Prints short usage message, and exits.

       After receiving a SIGUSR1 signal, Anacron waits for any running jobs to
       finish and then exits.  This can be used to stop Anacron cleanly.

       Make  sure  your	 time-zone  is set correctly before Anacron is started
       since the time-zone affects the date.  This is usually accomplished  by
       setting	the TZ environment variable, or by installing a /usr/lib/zone‐
       info/localtime file.  See tzset(3) for more information.

       Timestamp files are created in the spool directory for each job	speci‐
       fied  in an anacrontab.	These files are never removed automatically by
       Anacron, and should be removed by hand if a  job	 is  no	 longer	 being

	      Contains	specifications	of jobs.  See anacrontab(5) for a com‐
	      plete description.

	      This directory is used by Anacron for storing timestamp files.

       anacrontab(5), cron(8), tzset(3)

       The Anacron README file.

       Anacron never removes timestamp files.  Remove unused files manually.

       Anacron uses up to two file descriptors for each active	job.   It  may
       run  out	 of  descriptors  if  there are lots of active jobs.  See echo
       $(($(ulimit -n) / 2)) for information how many concurent	 jobs  anacron
       may run.

       Mail  comments,	suggestions  and  bug  reports	to Sean 'Shaleh' Perry

       Anacron was originally conceived and implemented by  Christian  Schwarz

       The  current  implementation is a complete rewrite by Itai Tzur ⟨itzur@⟩.

       The code base was maintained by Sean  'Shaleh'  Perry  ⟨shaleh@(debian.

       Since  2004,  it	 is  maintained	 by  Pascal  Hakim  ⟨pasc@(|⟩.

       For   Fedora,   Anacron	 is   maintained    by	  Marcela    Mašláňov�

cronie				  2012-11-22			    ANACRON(8)

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