




Command:   cron - clock daemon
Syntax:    cron
Flags:     (none)
Example:   /usr/bin/cron            # Use absolute path in /etc/rc

     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/tty0   #print date every minute
  0  *   *   *  *    /usr/bin/date >/dev/tty0   #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/tty0   #Xmas  morning  at  0900
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