`pg_receivexlog` renamed to `pg_receivewal`
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 app-pgreceivewal for documentation of pg_receivewal and see the release notes for PostgreSQL 10 for details on this change.