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PostgreSQL documentation
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<refentry id="APP-PGCONTROLDATA">
 <refmeta>
  <refentrytitle id="APP-PGCONTROLDATA-TITLE"><application>pg_controldata</application></refentrytitle>
  <manvolnum>1</manvolnum>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>pg_controldata</refname>
  <refpurpose>display server-wide control information</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <cmdsynopsis>
   <command>pg_controldata</command>
   <arg><replaceable class="parameter">datadir</replaceable></arg>
  </cmdsynopsis>
 </refsynopsisdiv>

 <refsect1 id="R1-APP-PGCONTROLDATA-1">
  <title>Description</title>
  <para>
   <command>pg_controldata</command> returns information initialized during
   <application>initdb</>. such as the catalog version and server encoding.
   It also shows information about write-ahead logging and checkpoint 
   processing.  This information is server-wide, and not specific to any one
   database.
  </para>

  <para>
   This utility may only be run by the user who installed the server because
   it requires read access to the <literal>datadir</>.
   You can specify the data directory on the command line, or use 
   the environment variable <envar>PGDATA</>.
  </para>
 </refsect1>

 <refsect1>
  <title>Environment</title>

  <variablelist>
   <varlistentry>
    <term><envar>PGDATA</envar></term>

    <listitem>
     <para>
      Default data direction location
     </para>
    </listitem>
   </varlistentry>

  </variablelist>
 </refsect1>
</refentry>

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