hmmm, let's see. You haven't specified PostgreSQL version or O/S as is common sense and courtesy, so I will choose one for you.
You are using PostgreSQL version 8.4 on Ubuntu 14.04
Since pg_dump requires an output file, and the database you are dumping must be known, just just the db name in the path.
eg: pg_dump unknown_db > /dumpdir/unknown_db/whatever_filename_you_want.dmp
Then you can get the db name by lookiing at the directory you dumped to! At least that is what most dba's would do.
You are using PostgreSQL version 8.4 on Ubuntu 14.04
Since pg_dump requires an output file, and the database you are dumping must be known, just just the db name in the path.
eg: pg_dump unknown_db > /dumpdir/unknown_db/whatever_filename_you_want.dmp
Then you can get the db name by lookiing at the directory you dumped to! At least that is what most dba's would do.
