Call \pset without any arguments displays current status of all printing options

https://commitfest.postgresql.org/action/patch_view?id=1202
http://archives.postgresql.org/message-id/CAFj8pRCmkZFDjaOfMwW5h2xBW4e=jtkN2S8bSKf8ksg8nAhsWw@mail.gmail.com