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sources/tech/20140901 Awesome systemd Commands to Manage Linux System.md
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(translating by szrlee)
Awesome ! systemd Commands to Manage Linux System
酷！用systemd命令来管理linux系统
================================================================================
Systemd is the new system and service manager for Linux. It is a replacement for init system and can manage system startup and services. It starts up and supervises the entire system. In article we are using [centos 7.0 installed with systemd 216 version][1] and the latest version is [available for download from freedesktop.org][2].
Systemd is the new system and service manager for Linux.
Systemd是一种新的linux系统服务管理器。
It is a replacement for init system and can manage system startup and services. It starts up and supervises the entire system. In article we are using [centos 7.0 installed with systemd 216 version][1] and the latest version is [available for download from freedesktop.org][2].
它替换了init系统，能够管理系统的启动过程和一些系统服务，一旦启动起来，就将监管整个系统。
With new player in town, PID 1 is occupied by “systemd” and can be seen from pstree command as well:
因为linux系统里这一新的玩家，PID 1被“systemd”占据了，这能通过pstree命令看到。
[root@linoxide ~]# pstree
![](http://linoxide.com/wp-content/uploads/2014/08/01.systemd_pstree.png)
Lets explore what systemd is capable of and what possibilities we have with the new replacement for sysVinit.
那么现在让我们来探索systemd擅长什么，它又有多大的可能性成为sysVinit的新的替代品。
### 1. Faster startup ###
The sysvinit starts the processes serially, one at a time. Systemd starts services in parallel and starts only those services which are actually required, reducing the boot time significantly.