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NAME

       systemd.cron - systemd cron units

SYNOPSIS

       cron.target,   cron-boot.timer,   cron-hourly.timer,  cron-daily.timer,
       cron-weekly.timer,    cron-monthly.timer,    cron-boot.target,    cron-
       hourly.target,     cron-daily.target,     cron-weekly.target,     cron-
       monthly.target,cron-boot.service,      cron-hourly.service,       cron-
       daily.service, cron-weekly.service, cron-monthly.service

DESCRIPTION

       These  units  provide  minimal  cron  daemon  functionality  by running
       scripts in cron directories.

FILES

       /etc/cron.boot
              Directory for scripts to be executed on boot.

       /etc/cron.hourly
              Directory for scripts to be executed every hour.

       /etc/cron.daily
              Directory for scripts to be executed every day.

       /etc/cron.weekly
              Directory for scripts to be executed every week.

       /etc/cron.monthly
              Directory for scripts to be executed every month.

SYSTEM UNITS

       cron.target
              The target unit which starts the others. This should be  enabled
              and started to use cron functionality.

       cron-schedule.timer
              The timer units which pull the cron-schedule.target units at the
              appropriate time. Started and stopped by the  cron.target  unit.
              These units cannot be controlled manually.

       cron-schedule.target
              The  targets  invoke all service units wanted by them, including
              cron-schedule.service.

       cron-schedule.service
              The service units which run scripts  in  the  cron  directories.
              Started  and  stopped  by  the cron-schedule.target units. These
              units cannot be controlled manually. You can  use  journalctl(1)
              to view the output of scripts run from these units.

LIMITATIONS

       These  units are not a drop-in replacement for a cron daemon. They only
       provide limited cron capabilites. For example user-defined crontabs are
       not  (yet) supported.  Do not use with a cron daemon, otherwise scripts
       may be executed multiple times.

EXAMPLES

       Start cron units
              # systemctl start cron.target

       Start cron units on boot
              # systemctl enable cron.target

       View script output
              # journalctl -u cron-boot
              # journalctl -u cron-hourly
              # journalctl -u cron-daily
              # journalctl -u cron-weekly
              # journalctl -u cron-monthly

       Example service file executed every hour
              [Unit]
              Description=Update the man db

              [Service]
              Nice=19
              IOSchedulingClass=2
              IOSchedulingPriority=7
              ExecStart=/usr/bin/mandb --quiet

              [Install]
              WantedBy=cron-hourly.target

NOTES

       1. The exact times scripts are executed is determined by the values  of
          the  special  calendar  events  hourly,  daily,  weekly, and monthly
          defined by systemd.time(7).

       2. run-parts(8) is used to run scripts. Scripts must be  executable  by
          root to run.

SEE ALSO

       systemd(1),   systemd.unit(5),  systemd.service(5),  systemd.target(5),
       systemd.timer(5), systemd.time(7), run-parts(8)



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