I have tried adding matrix users for postgres following the docs.
From the postgres prompt …
createuser (and have used CREATE USER) -U postgres matrix
this returns me to the postgres prompt …
I run the \du command to show users but all I get is the generic postgres user …
anyone have any thoughts?
cheers
You don't add the users from inside psql, you do it from the Linux command line. 
# createuser -U postgres matrix