How to change angular port from 4200 to any other

It seems things have changed in recent versions of the CLI (I'm using 6.0.1). I was able to change the default port used by ng serve by adding a port option to my project's angular.json:

{
    "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
    "projects": {
        "my-project": {
            "architect": {
                "serve": {
                    "options": {
                        "port": 4201
                    }
                }
            }
        }
    }
}

(Only relevant properties are shown in this example.)

The solution worked for me was

ng serve --port 4401    

(You can change 4401 to whatever number you want)

Then launch browser -> http://localhost:4401/

Basically, I was having two Applications and with the help of the above approach now I am able to run both of them simultaneously in my development environment.