<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/dropuser.sgml,v 1.42 2010/02/19 14:36:45 momjian Exp $
PostgreSQL documentation
-->

<refentry id="APP-DROPUSER">
 <refmeta>
  <refentrytitle id="APP-DROPUSER-TITLE"><application>dropuser</application></refentrytitle>
  <manvolnum>1</manvolnum>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>dropuser</refname>
  <refpurpose>remove a <productname>PostgreSQL</productname> user account</refpurpose>
 </refnamediv>

 <indexterm zone="app-dropuser">
  <primary>dropuser</primary>
 </indexterm>

 <refsynopsisdiv>
  <cmdsynopsis>
   <command>dropuser</command>
   <arg rep="repeat"><replaceable>connection-option</replaceable></arg>
   <arg rep="repeat"><replaceable>option</replaceable></arg>
   <arg><replaceable>username</replaceable></arg>
  </cmdsynopsis>
 </refsynopsisdiv>


 <refsect1>
  <title>Description</title>

  <para>
   <application>dropuser</application> removes an existing
   <productname>PostgreSQL</productname> user.
   Only superusers and users with the <literal>CREATEROLE</> privilege can
   remove <productname>PostgreSQL</productname> users.  (To remove a
   superuser, you must yourself be a superuser.)
  </para>

  <para>
   <application>dropuser</application> is a wrapper around the
   <acronym>SQL</acronym> command <xref linkend="SQL-DROPROLE"
   endterm="SQL-DROPROLE-title">.
   There is no effective difference between dropping users via
   this utility and via other methods for accessing the server.
  </para>

 </refsect1>


 <refsect1>
  <title>Options</title>

  <para>
   <application>dropuser</application> accepts the following command-line arguments:

    <variablelist>
     <varlistentry>
      <term><replaceable class="parameter">username</replaceable></term>
      <listitem>
       <para>
        Specifies the name of the <productname>PostgreSQL</productname> user to be removed. 
        You will be prompted for a name if none is specified on the command line.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-e</></term>
      <term><option>--echo</></term>
      <listitem>
       <para>
        Echo the commands that <application>dropuser</application> generates
        and sends to the server.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-i</></term>
      <term><option>--interactive</></term>
      <listitem>
       <para>
        Prompt for confirmation before actually removing the user.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
       <term><option>-V</></term>
       <term><option>--version</></term>
       <listitem>
       <para>
       Print the <application>dropuser</application> version and exit.
       </para>
       </listitem>
     </varlistentry>

     <varlistentry>
       <term><option>-?</></term>
       <term><option>--help</></term>
       <listitem>
       <para>
       Show help about <application>dropuser</application> command line
       arguments, and exit.
       </para>
       </listitem>
     </varlistentry>

    </variablelist>
  </para>

  <para>
   <application>dropuser</application> also accepts the following
   command-line arguments for connection parameters:
    
   <variablelist>
     <varlistentry>
      <term><option>-h <replaceable class="parameter">host</replaceable></></term>
      <term><option>--host <replaceable class="parameter">host</replaceable></></term>
      <listitem>
       <para>
        Specifies the host name of the machine on which the 
        server
        is running.  If the value begins with a slash, it is used 
        as the directory for the Unix domain socket.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-p <replaceable class="parameter">port</replaceable></></term>
      <term><option>--port <replaceable class="parameter">port</replaceable></></term>
      <listitem>
       <para>
        Specifies the TCP port or local Unix domain socket file 
        extension on which the server
        is listening for connections.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-U <replaceable class="parameter">username</replaceable></></term>
      <term><option>--username <replaceable class="parameter">username</replaceable></></term>
      <listitem>
       <para>
        User name to connect as (not the user name to drop).
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-w</></term>
      <term><option>--no-password</></term>
      <listitem>
       <para>
        Never issue a password prompt.  If the server requires
        password authentication and a password is not available by
        other means such as a <filename>.pgpass</filename> file, the
        connection attempt will fail.  This option can be useful in
        batch jobs and scripts where no user is present to enter a
        password.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-W</></term>
      <term><option>--password</></term>
      <listitem>
       <para>
        Force <application>dropuser</application> to prompt for a
        password before connecting to a database.  
       </para>

       <para>
        This option is never essential, since
        <application>dropuser</application> will automatically prompt
        for a password if the server demands password authentication.
        However, <application>dropuser</application> will waste a
        connection attempt finding out that the server wants a password.
        In some cases it is worth typing <option>-W</> to avoid the extra
        connection attempt.
       </para>
      </listitem>
     </varlistentry>
   </variablelist>
  </para>
 </refsect1>


 <refsect1>
  <title>Environment</title>

  <variablelist>
   <varlistentry>
    <term><envar>PGHOST</envar></term>
    <term><envar>PGPORT</envar></term>
    <term><envar>PGUSER</envar></term>

    <listitem>
     <para>
      Default connection parameters
     </para>
    </listitem>
   </varlistentry>
  </variablelist>

  <para>
   This utility, like most other <productname>PostgreSQL</> utilities,
   also uses the environment variables supported by <application>libpq</>
   (see <xref linkend="libpq-envars">).
  </para>

 </refsect1>


 <refsect1>
  <title>Diagnostics</title>

  <para>
   In case of difficulty, see <xref linkend="SQL-DROPROLE"
   endterm="sql-droprole-title"> and <xref linkend="APP-PSQL"> for
   discussions of potential problems and error messages.
   The database server must be running at the
   targeted host.  Also, any default connection settings and environment
   variables used by the <application>libpq</application> front-end
   library will apply.
  </para>

 </refsect1>


 <refsect1>
  <title>Examples</title>

   <para>
    To remove user <literal>joe</literal> from the default database
    server:
<screen>
<prompt>$ </prompt><userinput>dropuser joe</userinput>
</screen>
   </para>

   <para>
    To remove user <literal>joe</literal> using the server on host
    <literal>eden</literal>, port 5000, with verification and a peek at the underlying
    command:
<screen>
<prompt>$ </prompt><userinput>dropuser -p 5000 -h eden -i -e joe</userinput>
<computeroutput>Role "joe" will be permanently removed.
Are you sure? (y/n) </computeroutput><userinput>y</userinput>
<computeroutput>DROP ROLE joe;</computeroutput>
</screen>
   </para>
 </refsect1>


 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="app-createuser"></member>
   <member><xref linkend="sql-droprole" endterm="sql-droprole-title"></member>
  </simplelist>
 </refsect1>

</refentry>
