pg_controldata — display control information of a PostgreSQL database cluster
pg_controldata prints information initialized during
initdb, such as the catalog version.
It also shows information about write-ahead logging and checkpoint
processing. This information is cluster-wide, and not specific to any one
This utility can only be run by the user who initialized the cluster because
it requires read access to the data directory.
You can specify the data directory on the command line, or use
the environment variable
PGDATA. This utility supports the options
--version, which print the
pg_controldata version and exit. It also
--help, which output the
Default data directory location