14.2. 查看默认对象

流程

• 要确定默认使用哪个目标单元：

  $ systemctl get-default
  graphical.target

• 使用符号链接决定默认对象：

  $  ls -l /usr/lib/systemd/system/default.target

  = 查看目标单元

流程

• 列出所有载入的单元，而不考虑它们的状态：

  $ systemctl list-units --type target --all

• 要列出所有当前载入的目标单元：

  $ systemctl list-units --type target
  
  UNIT                  LOAD   ACTIVE SUB    DESCRIPTION
  basic.target          loaded active active Basic System
  cryptsetup.target     loaded active active Encrypted Volumes
  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.target        loaded active active Network
  paths.target          loaded active active Paths
  remote-fs.target      loaded active active Remote File Systems
  sockets.target        loaded active active Sockets
  sound.target          loaded active active Sound Card
  spice-vdagentd.target loaded active active Agent daemon for Spice guests
  swap.target           loaded active active Swap
  sysinit.target        loaded active active System Initialization
  time-sync.target      loaded active active System Time Synchronized
  timers.target         loaded active active Timers
  
  LOAD   = Reflects whether the unit definition was properly loaded.
  ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
  SUB    = The low-level unit activation state, values depend on unit type.
  
  17 loaded units listed.