O.2. pg_xlogdump renamed to pg_waldump
PostgreSQL 9.6 and below provided a command named pg_xlogdump to read write-ahead-log (WAL) files. This command was renamed to pg_waldump, see pg_waldump for documentation of pg_waldump and see the release notes for PostgreSQL 10 for details on this change.
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https://www.postgresql.org/docs/13/pgxlogdump.html