via: https://wangchujiang.com/linux-command/c/systemctl.html
- **systemctl命令** 是系统服务管理器指令，它实际上将 [[service]] 和 [[chkconfig]] 这两个命令组合到一起。
### 查看所有已启动的服务
```shell
systemctl list-units --type=service # same as `chkconfig --list`
```
- [systemctl 服务被锁定 masked_systemctl masked-CSDN博客](https://blog.csdn.net/PPlluuttoo/article/details/126781725)
```shell
systemctl mask sleep.target
systemctl unmask sleep.target
```