Where to set DISPLAY for Terminal

In what file can I place "export DISPLAY=localhost:0.0" so I can call up X11 apps from a Terminal window?

Hi Joe,
   Bill and Mihalis have excellent instructions for how to set the DISPLAY environment variable. I wish to make a suggestion about the value to which you set it. You don't have to set a hostname, just a number, in the display variable. An example would be:
DISPLAY='.0'
export DISPLAY
If you do this, local UNIX apps will connect to the local X11 server via a UNIX socket, whereas if you use a fully-qualified domain name, they will try to connect via a TCP network connection. By default, Apple's X11 doesn't listen for network connections, (only socket connections) so of these two choices, only the former work. I'm not sure what is done when the host specification is localhost. I think it will work but I wanted to provide an alternative in case it doesn't.
   Be sure that you follow Bill's advice for putting the command that sets the DISPLAY variable in a conditional that tests to see if it already exists. Otherwise, you'll break secure shell's X window forwarding.
Gary
~~~~
   Nostalgia isn't what it used to be.

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