杀掉关不掉的XWin程序

对控制台程序，通过pgrep很容易查到程序的 pid，通过pkill也可以杀掉它。

如果XWin程序跑飞了，用pgrep就不容易定位，比如java程序，系统里一大堆java进程，不知道哪个对应哪个窗口。此时可以使用，xwininfo 和 xkill 命令。

1. xwininfo 命令运行后，用鼠标点击一下窗口，会在控制台打印对应的x窗口的信息，比如：

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x1a00053 "tests – PlaceContractCest"

  Absolute upper-left X:  1920
  Absolute upper-left Y:  0
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 2560
  Height: 1440
  Depth: 24
  Visual: 0x21
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +1920+0  -0+0  -0-0  +1920-0
  -geometry 2560x1440-0+0

2. 用 xkill 命令杀掉他：

$ xkill -id 0x1a00053
xkill:  killing creator of resource 0x1a00053

此处的id，即 xwininfo 输出的 Windows id.