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<chapter id="libpq">
<envar>PGPASSWORD</envar>
sets the password used if the backend demands password
authentication. This functionality is deprecated for security
-reasons; consider migrating to <envar>PGPASSWORDFILE</envar>.
+reasons; consider migrating to use the <filename>$HOME/.pgpass</>
+file.
</para>
</listitem>
<listitem>