login [assuming no password required]:
postgresql -d <database name> -h <host name> -U <user name>
List schemas:
\dn
List tables in schema THE_SCHEMA:
\dt THE_SCHEMA.*
Describe table THE_SCHEMA.THE_TABLE:
\d THE_SCHEMA.THE_TABLE
postgresql -d <database name> -h <host name> -U <user name>
\dn
\dt THE_SCHEMA.*
\d THE_SCHEMA.THE_TABLE