Can PostgreSQL tell me what configuration files it's using? I am having trouble with some changes I'm making to a configuration file. I think PostgreSQL is not using the ones I'm modifying. Is there any way to get postgres (maybe some environment variable) to tell me where I can find the various config files, including pg_hba.conf and pg_ident.conf?
Certainly:

SHOW hba_file;
SHOW ident_file;


or just

SHOW ALL;


:-)