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/usr/bin/pg_lsclusters is in postgresql-common 134wheezy4.

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The actual contents of the file can be viewed below.

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#!/usr/bin/perl -wT
# Show all PostgreSQL clusters in a list
#
# (C) 2005-2009 Martin Pitt <mpitt@debian.org>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.

use lib '/usr/share/postgresql-common';
use PgCommon;
use Getopt::Long;

exit 1 unless GetOptions ('h|no-header' => \$no_header);

@columns = ('Version', 'Cluster', 'Port', 'Status', 'Owner', 'Data directory',
            'Log file');
@colwidths = qw/7 9 4 6 8 34 1/;

foreach $cw (@colwidths) {
    $fmtstring .= ' ' if $fmtstring;
    $fmtstring .= '%-'.$cw.'s';
}
$fmtstring .= "\n";

printf $fmtstring, @columns unless $no_header;

foreach $v (sort (get_versions())) {
    my @clusters = get_version_clusters $v;
    foreach $c (sort @clusters) {
        %info = cluster_info $v, $c;
        printf $fmtstring, ($v, $c, $info{'port'}, 
            ($info{'running'} ? "online" : "down") . ($info{'recovery'} ? ",recovery" : ""),
            defined $info{'owneruid'} ? (getpwuid $info{'owneruid'})[0] : '<unknown>', 
	    $info{'pgdata'} || '<not set>', $info{'logfile'} || 'custom');
    }
}

__END__

=head1 NAME

pg_lsclusters - show information about all PostgreSQL clusters

=head1 SYNOPSIS

B<pg_lsclusters> [I<options>]

=head1 DESCRIPTION

This command shows a list about the configuration and status of all clusters.

=head1 OPTIONS

=over 4

=item B<-h>, B<--no-header>

Do not print the column header line.

=back

=head1 AUTHOR

Martin Pitt L<E<lt>mpitt@debian.orgE<gt>>