doc: Improve {archive,restore}_command for compressed logs

The commands mentioned in the docs with gzip and gunzip did not prefix
the archives with ".gz" and used inconsistent paths for the archives,
which can be confusing.

Reported-by: Philipp Gramzow
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/161397938841.15451.13129264141285167267@wrigleys.postgresql.org

diff --git a/doc/src/sgml/backup.sgml b/doc/src/sgml/backup.sgml
index 3c8aaed0b6203ccb7db5a2cd363bbf8450d9ddb0..21094c6a9d056e3c3a0affbea3a6706ab84dc2f2 100644 (file)
--- a/doc/src/sgml/backup.sgml
+++ b/doc/src/sgml/backup.sgml
@@ -1520,11 +1520,11 @@ tar -rf /var/lib/pgsql/backup.tar /var/lib/pgsql/archive/
       If archive storage size is a concern, you can use
       <application>gzip</application> to compress the archive files:
 <programlisting>
-archive_command = 'gzip &lt; %p &gt; /var/lib/pgsql/archive/%f'
+archive_command = 'gzip &lt; %p &gt; /mnt/server/archivedir/%f.gz'
 </programlisting>
       You will then need to use <application>gunzip</application> during recovery:
 <programlisting>
-restore_command = 'gunzip &lt; /mnt/server/archivedir/%f &gt; %p'
+restore_command = 'gunzip &lt; /mnt/server/archivedir/%f.gz &gt; %p'
 </programlisting>
      </para>
     </sect3>