Which of the following lines is an example of a correct setting for the DISPLAY environment variable?

Which of the following lines is an example of a correct setting for the DISPLAY environment variable?
A . hostname:displayname
B . hostname:displaynumber
C . hostname/displayname
D . hostname/displaynumber
E . hostname

View Answer

Answer: B

Explanation:

The correct format for the DISPLAY environment variable is hostname:displaynumber.screennumber, where hostname is the name of the computer where the X server runs, displaynumber is a sequence number (usually 0) that identifies a display, and screennumber is the number of the screen within that display (usually 0). The screennumber can be omitted if it is 0. For example, localhost:0 or myhost:1.0 are valid values for the DISPLAY variable. The other options are either missing the colon, using the wrong separator, or not specifying the display number.

Reference: X11 – DISPLAY (environment variable) – Datacadamia

x11 – How can I specify a display? – Stack Overflow

What is the $DISPLAY environment variable? – Ask Ubuntu