mike@gauss:~$ sudo ls -a /var/lib/postgresql/
.  ..  9.1
mike@gauss:~$ sudo ls -a /var/lib/postgresql/9.1/
.  ..  main
mike@gauss:~$ sudo ls -a /var/lib/postgresql/9.1/main/
.     global	    pg_notify	 pg_subtrans  PG_VERSION       server.crt
..    pg_clog	    pg_serial	 pg_tblspc    pg_xlog	       server.key
base  pg_multixact  pg_stat_tmp  pg_twophase  postmaster.opts