'\" t
.\"     Title: pg_controldata
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 2023
.\"    Manual: PostgreSQL 13.10 Documentation
.\"    Source: PostgreSQL 13.10
.\"  Language: English
.\"
.TH "PG_CONTROLDATA" "1" "2023" "PostgreSQL 13.10" "PostgreSQL 13.10 Documentation"
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.SH "NAME"
pg_controldata \- display control information of a PostgreSQL database cluster
.SH "SYNOPSIS"
.HP \w'\fBpg_controldata\fR\ 'u
\fBpg_controldata\fR [\fIoption\fR] [[\fB\-D\fR | \fB\-\-pgdata\fR]\fIdatadir\fR]
.SH "DESCRIPTION"
.PP
\fBpg_controldata\fR
prints information initialized during
\fBinitdb\fR, 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\&.
.PP
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
\fBPGDATA\fR\&. This utility supports the options
\fB\-V\fR
and
\fB\-\-version\fR, which print the
pg_controldata
version and exit\&. It also supports options
\fB\-?\fR
and
\fB\-\-help\fR, which output the supported arguments\&.
.SH "ENVIRONMENT"
.PP
\fBPGDATA\fR
.RS 4
Default data directory location
.RE
.PP
\fBPG_COLOR\fR
.RS 4
Specifies whether to use color in diagnostic messages\&. Possible values are
always,
auto
and
never\&.
.RE