Historical version. PostgreSQL 11 has reached end of support. 2023-11-09. See the current manual.
L.3. pg_receivexlog renamed to pg_receivewal
PostgreSQL 9.6 and below provided a command named
pg_receivexlog
to fetch write-ahead-log (WAL) files. This command was renamed to pg_receivewal, see
pg_receivewal for documentation of pg_receivewal and see
the release notes for PostgreSQL 10 for details
on this change.
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Read the upstream documentation. For corrections, first check the current manual.