Connect to pgsql database in linux

Connect to pgsql database in linux

I have SDP installed in linux. 

HOw do I access the database via command line to review structure and such?

I navigated to ManageEngine/ServiceDesk/pgsql/bin
  1. ./psql -U postgres -p 65432 -d servicedesk
    psql: could not connect to server: No such file or directory
          Is the server running locally and accepting
          connections on Unix domain socket "/tmp/.s.PGSQL.65432"
I'm using port 65432 as that is what it seems to be using:
  1. postgres  1271  0.0  0.2  60140 10944 ?        S    Aug17   3:54 /srv/servicedesk/ManageEngine/ServiceDesk/pgsql/bin/postgres -D /srv/servicedesk/ManageEngine/ServiceDesk/pgsql/data -p65432