在末尾追加 sh脚本
sh脚本要提前赋予执行权限
下面是测试，开机同步北京时间
[root@commonTest bin]# vi /usr/local/bin/data.sh
#!bin/bash
ntpdate ntp1.aliyun.com
[root@commonTest bin]# chmod 755 data.sh
[root@commonTest bin]# vim /etc/rc.d/rc.local
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
touch /var/lock/subsys/local
/usr/local/bin/date.sh