small doubt

when i use
 /usr/local/pgsql/bin/psql test
this i am getting following error
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.5432"?

should i restart the server or what should be done  for this

how can i resolve this  issue

Thanks & Regards
  kusuma.p