example16.14

UNIX[1].shell范例精解(第4版)_code

#! /bin/bash
# crond Start/Stop the cron clock daemon.
#
# chkconfig: 2345 90 60
# description: cron is a standard UNIX program that runs 
# user-specified programs at periodic scheduled times.
# config: /etc/crontab
# pidfile: /var/run/crond.pid

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

RETVAL=0 ; prog="crond"

start() {
	echo -n $"Starting $prog: "
	daemon crond
	RETVAL=$?
	echo
	[ $RETVAL -eq 0 ] && touch /var/lock/subsys/crond
	return RETVAL
}
stop() {
	echo -n $"Stopping $prog: "
	killproc crond
	RETVAL=$?
	echo
	[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/crond
		return RETVAL
}
restart() {  stop ; start }
case "$1" in
	start)   start           ;;
	stop)    stop            ;;
	restart) restart         ;;
	*)       echo $"Usage: $0 {start|stop|restart}"
exit 1          ;;
esac