Help, How to start the server??

i use postgresql-9.2.4 install on ubuntu11.04(natty)
and i use the command:

*postgres(at)ubuntu:/$ postgres -D /usr/local/pgsql/data*

or use

*postgres(at)ubuntu:/$ /usr/local/pgsql/bin/postmaster -D
/usr/local/pgsql/data*

to start the server
but it's stopping at the message:

*LOG: database system was shut down at 2013-05-24 15:07:34 CST
LOG: database system is ready to accept connections
LOG: autovacuum launcher started*

for a long time
it seems never continue again
and i don't know how to do next...
can anyone tell me is there anything wrong? or how to do next?

thank you

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