I'm attempting today to get streaming replication from the Wiki configured on my two 9.1.2 servers:

Streaming Replication - PostgreSQL wiki

I'm on step #6

6. Make a base backup by copying the primary server's data directory to the standby server.

Code:
 $ psql -c "SELECT pg_start_backup('label', true)"
$ rsync -a ${PGDATA}/ standby:/srv/pgsql/standby/ --exclude postmaster.pid
$ psql -c "SELECT pg_stop_backup()"
When I attempt the 1st command listed on my primary (master) server, I get this error:

Code:
carlos@db1:~$ psql -c "SELECT pg_start_backup('label', true)"
psql: FATAL:  database "carlos" does not exist
Now I'm showing they want me to use the -c switch to connect but no database is defined so is it implied that I need to add 'postgres' maintenance database in there or something else?