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RedHat 9 (Linux i386) - man page for pg_controldata (redhat section 1)

PG_CONTROLDATA(1)					  PostgreSQL Server Applications					 PG_CONTROLDATA(1)

pg_controldata - display server-wide control information
pg_controldata [ datadir ]
pg_controldata returns information initialized during initdb, such as the catalog version and server locale. It also shows information about write-ahead logging and checkpoint processing. This information is server-wide, and not specific to any one database. This utility may only be run by the user who installed the server because it requires read access to the datadir. You can specify the data directory on the command line, or use the environment variable PGDATA.
PGDATA Default data directory location Application 2002-11-22 PG_CONTROLDATA(1)