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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>pg_controldata</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="app-pgchecksums.html" title="pg_checksums" /><link rel="next" href="app-pg-ctl.html" title="pg_ctl" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center"><span class="application">pg_controldata</span></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="app-pgchecksums.html" title="pg_checksums">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="reference-server.html" title="PostgreSQL Server Applications">Up</a></td><th width="60%" align="center">PostgreSQL Server Applications</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="app-pg-ctl.html" title="pg_ctl">Next</a></td></tr></table><hr /></div><div class="refentry" id="APP-PGCONTROLDATA"><div class="titlepage"></div><a id="id-1.9.5.6.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle"><span class="application">pg_controldata</span></span></h2><p>pg_controldata — display control information of a <span class="productname">PostgreSQL</span> database cluster</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p id="id-1.9.5.6.4.1"><code class="command">pg_controldata</code> [<em class="replaceable"><code>option</code></em>] [[ <code class="option">-D</code>  |   <code class="option">--pgdata</code> ]<em class="replaceable"><code>datadir</code></em>]</p></div></div><div class="refsect1" id="R1-APP-PGCONTROLDATA-1"><h2>Description</h2><p>
+   <code class="command">pg_controldata</code> prints information initialized during
+   <code class="command">initdb</code>, such as the catalog version.
+   It also shows information about write-ahead logging and checkpoint
+   processing.  This information is cluster-wide, and not specific to any one
+   database.
+  </p><p>
+   This utility can only be run by the user who initialized the cluster because
+   it requires read access to the data directory.
+   You can specify the data directory on the command line, or use
+   the environment variable <code class="envar">PGDATA</code>.  This utility supports the options
+   <code class="option">-V</code> and <code class="option">--version</code>, which print the
+   <span class="application">pg_controldata</span> version and exit.  It also
+   supports options <code class="option">-?</code> and <code class="option">--help</code>, which output the
+   supported arguments.
+  </p></div><div class="refsect1" id="id-1.9.5.6.6"><h2>Environment</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="envar">PGDATA</code></span></dt><dd><p>
+      Default data directory location
+     </p></dd><dt><span class="term"><code class="envar">PG_COLOR</code></span></dt><dd><p>
+      Specifies whether to use color in diagnostic messages. Possible values
+      are <code class="literal">always</code>, <code class="literal">auto</code> and
+      <code class="literal">never</code>.
+     </p></dd></dl></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="app-pgchecksums.html" title="pg_checksums">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference-server.html" title="PostgreSQL Server Applications">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="app-pg-ctl.html" title="pg_ctl">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="application">pg_checksums</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> <span class="application">pg_ctl</span></td></tr></table></div></body></html>
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