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    Command:

    anacron

    
    
    

    SYNOPSIS

           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]
    
    
    

    DESCRIPTION

           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 aren't
           running 24 hours a day, to control regular jobs as daily,  weekly,  and
           monthly jobs.
    
           Anacron reads a list of jobs from a configuration file, /etc/anacrontab
           (see anacrontab(5)).  This file contains the list of jobs that  Anacron
           controls.   Each  job entry specifies a period in days, a delay in min-
           utes, 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 period specified for that job.  If not,
           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 in a special times-
           tamp file for that job, so it can know when to execute it again.   Only
           the date is used for the time calculations.  The hour is not used.
    
           When there are no more jobs to be run, Anacron exits.
    
           Anacron  only  considers  jobs  whose  identifier,  as specified in the
           anacrontab matches any of the  job  command-line  arguments.   The  job
           arguments  can be shell wildcard patterns (be sure to protect them from
           your shell with adequate quoting).  Specifying  no  job  arguments,  is
           equivalent to specifying "*"  (That is, all jobs will be considered).
    
           Unless  the  -d option is given (see below), Anacron forks to the back-
           ground when it starts, and the parent process exits immediately.
    
           Unless the -s or -n options are given, Anacron starts jobs  immediately
           when  their  delay  is  over.   The execution of different jobs is com-
           pletely independent.
    
           If a job generates any output on its standard output or standard error,
           the  output is mailed to the user running Anacron (usually root), or to
           the address  contained  by  the  MAILTO  environment  variable  in  the
           crontab, if such exists. If the LOGNAME environment variable is set, it
           will be used as From: field.
    
           Informative messages about what Anacron is doing are sent to syslogd(8)
           or  rsyslogd(8)  under  facility cron, priority notice.  Error messages
           are sent at priority error.
    
           -n     Run   jobs   now.    Ignore  the  delay  specifications  in  the
                  /etc/anacrontab file.  This options implies -s.
    
           -d     Don't fork to the background.  In this mode, Anacron will output
                  informational  messages to standard error, as well as to syslog.
                  The output of jobs is mailed as usual.
    
           -q     Suppress messages to standard error.  Only applicable with -d.
    
           -t some_anacrontab
                  Use specified anacrontab, rather than the default
    
           -T     Anacrontab testing. The configuration file will  be  tested  for
                  validity.  If  there  is  an error in the file, an error will be
                  shown and anacron will return 1. Valid anacrontabs  will  return
                  0.
    
           -S spooldir
                  Use  the  specified spooldir to store timestamps in. This option
                  is required for users who wish to run anacron themselves.
    
           -V     Print version information, and exit.
    
           -h     Print short usage message, and exit.
    
    
    

    SIGNALS

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

    NOTES

           Make sure that  the  time-zone  is  set  correctly  before  Anacron  is
           started.   (The  time-zone  affects  the date).  This is usually accom-
           plished by setting the TZ environment  variable,  or  by  installing  a
           /usr/lib/zoneinfo/localtime file.  See tzset(3) for more information.
    
           Timestamp  files  are  created  in  the spool directory for each job in
           anacrontab. These are  never  removed  automatically  by  anacron,  and
           should be removed by hand if a job is no longer being scheduled.
    
    
    

    FILES

           /etc/anacrontab
                  Contains  specifications  of jobs.  See anacrontab(5) for a com-
                  plete description.
    
           /var/spool/anacron
                  This directory is used by Anacron for storing timestamp files.
    
    
    

    SEE ALSO

           anacrontab(5),cron(8),tzset(3)
    
           The Anacron README file.
    
           The  current  implementation  is  a  complete  rewrite  by  Itai   Tzur
           <itzur@actcom.co.il>.
    
           The    code    base    was    maintained   by   Sean   'Shaleh'   Perry
           <shaleh@(debian.org|valinux.com)>.
    
           Since 2004, it is maintained by Pascal  Hakim  <pasc@(debian.org|redel-
           lipse.net)>.
    
           For  Fedora  is  anacron maintained by Marcela Maslanova <mmaslano@red-
           hat.com>.
    
    
    

    Marcela Maslanova 2009-07-17 ANACRON(8)

    
    
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