# cron(8)

    NAME
         cron - clock daemon

    SYNOPSIS
         cron

    EXAMPLES

         /usr/bin/cron       # Use absolute path in /etc/rc

    DESCRIPTION

         Cron is clock daemon.  It  is  typically  started  up  by  including  the
         command /usr/bin/cron in the /etc/rc file. Once started, cron puts itself
         in the background, so no & is needed.  It runs forever, sleeping most  of
         the time.  Once a minute it wakes up and examines /usr/lib/crontab to see
         if there is any work to do.  If there is, the work is done.  The  entries
         of /usr/lib/crontab contain 6 elements each.  Some examples follow:

          Min Hr Dat Mo Day   Command
           *  *   *   *  *    /usr/bin/date >/dev/log   #print date every minute
           0  *   *   *  *    /usr/bin/date >/dev/log   #print date on the hour
          30  4   *   * 1-5   /bin/backup /dev/fd1      #do backup Mon-Fri at 0430
          30 19   *   * 1,3,5 /etc/backup /dev/fd1      #Mon, Wed, Fri at 1930
           0  9  25  12  *    /usr/bin/sing >/dev/log   #Xmas morning at 0900 only

    SEE ALSO
         at(1).