查看“Systemctl 常用命令”的源代码

<pre>
如何激活服务并在启动时启用或禁用服务（即系统启动时自动启动服务）
 systemctl is-active ssh.service
# systemctl enable ssh.service
# systemctl disable ssh.service

如何屏蔽（让它不能启动）或显示服务（如 httpd.service）
# systemctl mask httpd.service
ln -s '/dev/null' '/etc/systemd/system/httpd.service'
# systemctl unmask httpd.service
rm '/etc/systemd/system/httpd.service' </pre>

=参考=
[ http://man.linuxde.net/systemctl systemctl命令 ]

[https://linux.cn/article-5926-1.html systemctl 命令完全指南]