假设我不想要知道这么多的

unit

项目，我只想要知道

service

这种类别的

daemon

而已，而且不论

是否已经启动，通通要列出来！

那该如何是好？

[root@study ~]#

systemctl list

-

units

--

type=service

--

all

#

只剩下

*.service

的

项

目才

会

出

现

喔！

范例一：查

询

系

统

上是否有以

cpu

为

名的服

务

？

[root@study ~]#

systemctl list

-

units

--

type=service

--

all | grep cpu

cpupower.service loaded inactive dead Configure CPU power related settings

#

确

实

有喔！可以改

变

CPU

电

源管理机制的服

务

哩！

17.2.3

透过

systemctl

管理不同的操作环境

(target unit)

透过上个小½我们知道系统上所有的

systemd

的

unit

观察的方式，那么可否列出跟操作½面比½有

关的

target

项目呢？

很简单啊！就这样搞一下：

[root@study ~]#

systemctl list

-

units

--

type=target

--

all

UNIT LOAD ACTIVE SUB DESCRIPTION

basic.target loaded active active Basic System

cryptsetup.target loaded active active Encrypted Volumes

emerg

ency.target loaded inactive dead Emergency Mode

final.target loaded inactive dead Final Step

getty.target loaded active active Login Prompts

graphical.target loaded active active Graphical Interface

local

-

fs

-

pre.target loaded active active Local File Systems (Pre)

local

-

fs.target loaded active active Local File Systems

multi

-

user.target loaded active active Multi

-

User System

network

-

online.target loaded inactive dead Network is

Online

network.target loaded active active Network

nss

-

user

-

lookup.target loaded inactive dead User and Group Name Lookups

paths.target loaded active active Paths

remote

-

fs

-

pre.target loaded active active Remote File Systems (P

re)

remote

-

fs.target loaded active active Remote File Systems

rescue.target loaded inactive dead Rescue Mode

shutdown.target loaded inactive dead Shutdown

slices.target loaded active active Slices

sockets.target

loaded active active Sockets

sound.target loaded active active Sound Card

swap.target loaded active active Swap

sysinit.target loaded active active System Initialization

syslog.target not

-

found inactive dead

syslog.target

time

-

sync.target loaded inactive dead System Time Synchronized