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| systemctl list-units ##列出当前系统服务的状态
systemctl list-unit-files ##列出服务的开机状态
systemctl status sshd ##查看指定服务的状态
systemctl stop sshd ##关闭指定服务
systemctl start sshd ##开启指定服务
systemctl restart sshd ##从新启动服务
systemctl enable sshd ##设定指定服务开机开启
systemctl disable sshd ##设定指定服务开机关闭
systemctl reload sshd ##使指定服务从新加载配置
systemctl list-dependencies sshd ##查看指定服务的倚赖关系
systemctl mask sshd ##冻结指定服务
systemctl unmask sshd ##启用服务
systemctl set-default multi-user.target ##开机不开启图形
systemctl set-default graphical.target ##开机启动图形
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