FreeKB - Linux Fundamentals Understanding the $DISPLAY variable
Linux Fundamentals - Understanding the $DISPLAY variable

The DISPLAY variable will contain 3 pieces of information:

  • Hostname
  • Sequence Number
  • Screen Number

In this example, the hostname is localhost, the sequence number is 10, and the screen number is 0. The english version of this would be "screen 0 on display 10, on my computer."

[john.doe@server1 ~]# echo $DISPLAY


In this example, the sequence number is 0 and the screen number is 0. This is very command. This means "the first screen on your main display."

[john.doe@server1 ~]# echo $DISPLAY



The hostname is the name of computer running the X server. When hostname is localhost, this means the local system is the X server.


Sequence number

The sequence number can vary based on the number of monitors connected to the computer.


Screen number

0 is the default screen number. A system can have numerous screens.

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