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  1. Introduction
  2. Boot Process
  3. Init and System Initialization
  4. rc.sysinit script
  5. rc script
  6. functions script
  7. Services
  8. apm daemon
  9. network startup
  10. The network script file
  11. The network-functions file
  12. Portmap startup
  13. Random initialization
  14. Syslog initialization
  15. Gated
  16. Atd
  17. cron initialization
  18. pcmcia
  19. inetd daemon
  20. named daemon
  21. lpd daemon
  22. mars-nwe
  23. netfs startup
  24. dhcpd daemon
  25. autofs daemon
  26. keytable daemon
  27. sendmail daemon
  28. gpm daemon
  29. httpd daemon
  30. xfs startup
  31. smb startup
  32. innd startup
  33. linuxconf startup
  34. rc.local script
  35. Init, Getty, Login
  36. The shell
  37. Shutting down
  38. X
  39. Conclusions
  40. App A. rc.sysinit listing
  41. App B. functions listing
  42. App C. rc listing
  43. Credits

Linux Cron

This script controls the start, stopping, restarting, and status reporting for the cron deamon which is used by the system to execute commands at periodic times.

The crond startup script

#! /bin/sh
#
# crond          Start/Stop the cron clock daemon.
#
# chkconfig: 2345 40 60
# description: cron is a standard UNIX program that runs user-specified \
#              programs at periodic scheduled times. vixie cron adds a \
#              number of features to the basic UNIX cron, including better \
#              security and more powerful configuration options.
# processname: crond
# config: /etc/crontab
# pidfile: /var/run/crond.pid

# Source function library.
. /etc/rc.d/init.d/functions

RETVAL=0

# See how we were called.
case "$1" in
  start)
	echo -n "Starting cron daemon: "
	daemon crond
	RETVAL=$?
	echo
	[ $RETVAL -eq 0 ] && touch /var/lock/subsys/crond
	;;
  stop)
	echo -n "Stopping cron daemon: "
	killproc crond
	RETVAL=$?
	echo
	[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/crond
	;;
  status)
	status crond
	RETVAL=$?
	;;
  restart)
  	$0 stop
	$0 start
	RETVAL=$?
	;;
  reload)
	killall -HUP crond
	RETVAL=$?
	;;
  *)
	echo "Usage: crond {start|stop|status|restart}"
	exit 1
esac

exit $RETVAL