*/10 * * * * /usr/sbin/ntpdate 192.168.0.9 > /dev/null 2>&1
0 12 * * * /bin/bash /root/send_email_for_dhcp.sh > /dev/null 2>&1
10 0 * * * /bin/bash /root/clean_dhcp.sh > /dev/null 2>&1
0 1 * * * /bin/bash /root/backup_j_l_net.sh
15 1 * * * /bin/bash /root/backup_j_l_sql.sh
30 1 * * * /usr/bin/find /backup/web -mtime +18 -name "*.tar.gz" -exec /Usr/bin/rm -rf {} \;
45 1 * * * /usr/bin/find /backup/mysql -mtime +18 -name "*.sql" -exec /usr/bin/rm -rf {} \;