pg_receivexlog Command

1st chunk of `doc/src/sgml/appendix-obsolete-pgreceivexlog.sgml`

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<sect1 id="app-pgreceivexlog" xreflabel="pg_receivexlog">
  <title><command>pg_receivexlog</command> renamed to <command>pg_receivewal</command></title>

   <indexterm>
     <primary>pg_receivexlog</primary>
     <see>pg_receivewal</see>
   </indexterm>

   <para>
    PostgreSQL 9.6 and below provided a command named
    <command>pg_receivexlog</command>
    <indexterm><primary>pg_receivexlog</primary></indexterm>
    to fetch write-ahead-log (WAL) files.  This command was renamed to <command>pg_receivewal</command>, see
    <xref linkend="app-pgreceivewal"/> for documentation of <command>pg_receivewal</command> and see
    <link linkend="release-prior">the release notes for PostgreSQL 10</link> for details
    on this change.
   </para>

</sect1>

Title: pg_receivexlog Command

Summary

The pg_receivexlog command has been renamed to pg_receivewal in PostgreSQL 10 and later versions, with documentation available in the pg_receivewal section. This change was made to improve the functionality of fetching write-ahead-log (WAL) files, and users of PostgreSQL 9.6 and below should refer to the release notes for PostgreSQL 10 for more information on this change and how to adapt to the new command.