/usr/bin/pg_rewind

pg_rewind resynchronizes a PostgreSQL cluster with another copy of the cluster.

Usage:
  pg_rewind [OPTION]...

Options:
  -c, --restore-target-wal       use "restore_command" in target configuration to
                                 retrieve WAL files from archives
  -D, --target-pgdata=DIRECTORY  existing data directory to modify
      --source-pgdata=DIRECTORY  source data directory to synchronize with
      --source-server=CONNSTR    source server to synchronize with
  -n, --dry-run                  stop before modifying anything
  -N, --no-sync                  do not wait for changes to be written
                                 safely to disk
  -P, --progress                 write progress messages
  -R, --write-recovery-conf      write configuration for replication
                                 (requires --source-server)
      --config-file=FILENAME     use specified main server configuration
                                 file when running target cluster
      --debug                    write a lot of debug messages
      --no-ensure-shutdown       do not automatically fix unclean shutdown
      --sync-method=METHOD       set method for syncing files to disk
  -V, --version                  output version information, then exit
  -?, --help                     show this help, then exit

Report bugs to <pgsql-bugs@lists.postgresql.org>.
PostgreSQL home page: <https://www.postgresql.org/>