[[2022-04-02]] ==2022-04-03 18:57==

1. X11
   1. what is X11
   2. X11 drivers
   3. X11 project
   4. X11 sshd_config
   5. display managers
   6. check your driver
   7. update your driver
      1. ```sudo apt-get install –reinstall xserver-xorg-video-intel xserver-xorg-core sudo apt-get install –reinstall xserver-xorg
      2. Xorg -configure
      3. cp /root/xorg.conf.new /etc/X11/xorg.conf #xserver_error #solve_the_display
   8. X11 all problem
2. dome shell tool or program
   1. sort
   2. ps –eo
   3. echo -e
   4. math :–> expr` `
   5. echo ( ‘hello how are you’ ( uname))