Document that PGPASSWORD is not secure.

doc/src/sgml/libpq++.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/Attic/libpq++.sgml,v 1.35 2001/11/21 05:53:41 thomas Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/Attic/libpq++.sgml,v 1.36 2001/11/28 19:57:36 momjian Exp $
 -->
 
  <chapter id="libpqplusplus">
@@ -109,7 +109,9 @@ $Header: /cvsroot/pgsql/doc/src/sgml/Attic/libpq++.sgml,v 1.35 2001/11/21 05:53:
       <listitem>
        <para>
 	<envar>PGPASSWORD</envar>
-	sets the password used if the backend demands password authentication.
+	sets the password used if the backend demands password
+	authentication. This is not recommended because the password can
+	be read by others using <command>ps -e</command>.
        </para>
       </listitem>
       <listitem>

doc/src/sgml/libpq.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.80 2001/11/21 22:57:01 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.81 2001/11/28 19:57:36 momjian Exp $
 -->
 
  <chapter id="libpq">
@@ -2013,7 +2013,9 @@ sets the user name used to connect to the database and for authentication.
  <primary><envar>PGPASSWORD</envar></primary>
 </indexterm>
 <envar>PGPASSWORD</envar>
-sets the password used if the backend demands password authentication.
+sets the password used if the backend demands password
+authentication. This is not recommended because the password can
+be read by others using <command>ps -e</command>.
 </para>
 </listitem>
 <listitem>