value),
           <literal>column</literal>, <literal>page</literal>, or an
           <replaceable class="parameter">integer value</replaceable>.
          </para>

          <para>
           <literal>full</literal>: the expanded header is not truncated,
           and will be as wide as the widest output line.
          </para>

          <para>
           <literal>column</literal>: truncate the header line to the
           width of the first column.
          </para>

          <para>
           <literal>page</literal>: truncate the header line to the terminal
           width.
          </para>

          <para>
           <replaceable class="parameter">integer value</replaceable>: specify
           the exact maximum width of the header line.
          </para>
          </listitem>
          </varlistentry>
        </variablelist>
        </para>

        <para>
        Illustrations of how these different formats look can be seen in
        <xref linkend="app-psql-examples"/>, below.
        </para>

        <tip>
        <para>
        There are various shortcut commands for <command>\pset</command>. See
        <command>\a</command>, <command>\C</command>, <command>\f</command>,
        <command>\H</command>, <command>\t</command>, <command>\T</command>,
        and <command>\x</command>.
        </para>
        </tip>

        </listitem>
      </varlistentry>


      <varlistentry id="app-psql-meta-command-quit">
        <term><literal>\q</literal> or <literal>\quit</literal></term>
        <listitem>
        <para>
        Quits the <application>psql</application> program.
        In a script file, only execution of that script is terminated.
        </para>
        </listitem>
      </varlistentry>


      <varlistentry id="app-psql-meta-command-qecho">
        <term><literal>\qecho <replaceable class="parameter">text</replaceable> [ ... ] </literal></term>
        <listitem>
        <para>
        This command is identical to <command>\echo</command> except
        that the output will be written to the query output channel, as
        set by <command>\o</command>.
        </para>
        </listitem>
      </varlistentry>


      <varlistentry id="app-psql-meta-command-reset">
        <term><literal>\r</literal> or <literal>\reset</literal></term>
        <listitem>
        <para>
        Resets (clears) the query buffer.
        </para>
        </listitem>
      </varlistentry>


      <varlistentry id="app-psql-meta-command-s">
        <term><literal>\s [ <replaceable class="parameter">filename</replaceable> ]</literal></term>
        <listitem>
        <para>
        Print <application>psql</application>'s command line history
        to <replaceable class="parameter">filename</replaceable>.
        If <replaceable class="parameter">filename</replaceable> is omitted,
        the history is written to the standard output (using the pager if
        appropriate).  This command is not available
        if <application>psql</application> was built
        without <application>Readline</application> support.
        </para>
        </listitem>
      </varlistentry>


      <varlistentry id="app-psql-meta-command-set">
        <term><literal>\set [ <replaceable class="parameter">name</replaceable> [ <replaceable class="parameter">value</replaceable> [ ... ] ] ]</literal></term>

        <listitem>
        <para>
        Sets the <application>psql</application> variable <replaceable
        class="parameter">name</replaceable> to <replaceable
        class="parameter">value</replaceable>, or if more than one value
        is given, to the concatenation of all of them. If only one
        argument is given, the variable is set to an empty-string value. To
        unset a variable, use the <command>\unset</command> command.
        </para>

        <para><command>\set</command> without any arguments displays the names and values
        of all currently-set <application>psql</application> variables.
        </para>