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<refentry id="APP-PG-PASSWD">
 <refmeta>
  <refentrytitle id="APP-PG-PASSWD-TITLE">
   <application>pg_passwd</application>
  </refentrytitle>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname>
   <application>pg_passwd</application>
  </refname>
  <refpurpose>
   Manipulate the flat password file
  </refpurpose>
 </refnamediv>
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>1999-07-20</date>
  </refsynopsisdivinfo>
  <synopsis>
pg_passwd <replaceable class="parameter">filename</replaceable>
  </synopsis>
 </refsynopsisdiv>

 <refsect1 id="R1-APP-PG-PASSWD-1">
  <refsect1info>
   <date>1999-07-20</date>
  </refsect1info>
  <title>
   Description
  </title>
  <para>
   <application>pg_passwd</application>
   is a tool to manipulate the
   flat password file functionality of
   <productname>Postgres</productname>. This style of password
   authentication is not <emphasis>required</emphasis> in an
   installation, but is one of several supported security mechanisms.
  </para>

  <para>
   Specify the password file in the same style of
   <literal>Ident</literal> authentication in
   <filename>$PGDATA/pg_hba.conf</filename>:

   <programlisting>
host  unv     133.65.96.250   255.255.255.255 password passwd
   </programlisting>

   where the above line allows access from 133.65.96.250 using the passwords listed
   in <filename>$PGDATA/passwd</filename>.
   The format of the password file follows those of
   <filename>/etc/passwd</filename>
   and
   <filename>/etc/shadow</filename>.
   The first field is the user name, and  the second field
   is the encrypted password.
   The rest is completely ignored.
   Thus the following three sample lines specify the same user and password pair:

   <programlisting>
pg_guest:/nB7.w5Auq.BY:10031::::::
pg_guest:/nB7.w5Auq.BY:93001:930::/home/guest:/bin/tcsh
pg_guest:/nB7.w5Auq.BY:93001
   </programlisting>
  </para>

  <para>
   Supply the password file to the pg_passwd command.
   In the case described above, after changing the working directory to
   <envar>PGDATA</envar>, the following command execution specifies
   the new password for <literal>pg_guest</literal>:

   <programlisting>
	$ pg_passwd passwd
	Username: pg_guest
	Password:
	Re-enter password:
   </programlisting>

   where the <literal>Password:</literal>
   and <literal>Re-enter password:</literal>
   prompts require the same password input which are not displayed
   on the terminal.
   The original password file is renamed to
   <filename>passwd.bk</filename>.
  </para>

  <para>
   <application>psql</application>
   uses the <option>-u</option>
   option to invoke this style of
   authentication.
  </para>

  <para>
   The following lines show the sample usage of the option:

<programlisting>
$ psql -h hyalos -u unv
Username: pg_guest
Password:
Welcome to the POSTGRESQL interactive sql monitor:
  Please read the file COPYRIGHT for copyright terms of POSTGRESQL
   type \? for help on slash commands
   type \q to quit
   type \g or terminate with semicolon to execute query
 You are currently connected to the database: unv
unv=>
   </programlisting>
  </para>

  <para>
   Perl5 authentication
   uses the new style of the <filename>Pg.pm</filename> like this:

   <programlisting>
$conn = Pg::connectdb("host=hyalos dbname=unv
                       user=pg_guest password=xxxxxxx");
   </programlisting>

   For more details, refer to 
   <filename>src/interfaces/perl5/Pg.pm</filename>.
  </para>

  <para>
   Pg{tcl,tk}sh authentication
   uses the
   <function>pg_connect</function>
   command with the
   <option>-conninfo</option>
   option thusly:

<programlisting>
% set conn [pg_connect -conninfo \\
            "host=hyalos dbname=unv \\
             user=pg_guest password=xxxxxxx "]
   </programlisting>

   You can list all of the keys for the option by executing the following
   command:

   <programlisting>
% puts [ pg_conndefaults]
   </programlisting>
  </para>
 </refsect1>
</refentry>

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