How to change value of process.env.PORT in node.js?

Question

I'd like to change the value of process.env.PORT, how can I do this?

I'm running Ubuntu 12.04.

Answer 1

For just one run (from the unix shell prompt):

$ PORT=1234 node app.js

More permanently:

$ export PORT=1234
$ node app.js

In Windows:

set PORT=1234

In Windows PowerShell:

$env:PORT = 1234