Excerpts from Florian Weimer's message of Wed Nov 23 13:04:47 +0200 2011:
>
> * Alexander Shulgin:
>
> > This, in my opinion, is very similar to what we would like to achieve with the URI syntax, so the above could also be specified using a URI parameter like this:
> >
> > psql -d postgresql://example.net:5433/mydb
>
> How would you specifiy a local port/UNIX domain socket?
Missed that in my previous reply.
If host part of the URI points to localhost, the UNIX domain socket would be considered by libpq just as if you would pass "-h localhost -p 5433".