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		)
	{
		my @ownerlines_unique
			= uniqstr sort @{ $patternownerlines{$pattern} };
		@ownerlines_unique = ('NONE') unless (@ownerlines_unique);
		print 'Files: ',
			join(
			unbackslash( $OPT{'list-delimiter'}, ),
			sort @{ $patternfiles{$pattern} }
			),
			"\n";
		print 'Copyright: ',
			join(
			unbackslash( $OPT{'rfc822-delimiter'}, ),
			@ownerlines_unique
			),
			"\n";
		print "License: $patternlicense{$pattern}\n FIXME\n\n";
	}
}

=head1 ENVIRONMENT

=over 6

=item NO_COLOR

If defined, will disable color.
Consulted before COLOR.

=item COLOR

Can be set to 0 to explicitly disable colors.
The default is to use color when connected to a terminal.

=item LOG_LEVEL

=item QUIET

=item VERBOSE

=item DEBUG

=item TRACE

Used to emit varying details about discoveries to STDERR
when verbosity is not set
using either of options B<--quiet>, B<--verbose>, B<--debug> or B<--trace>.
See L<Log::Any::Adapter::Screen> for more details.

=item LOG_PREFIX

The default formatter groks these variables.
See B<formatter> in L<Log::Any::Adapter::Screen> for more details.

=back

=head1 CAVEATS

The exact output may change between releases,
due to the inherently fragile scanning of unstructured data,
and the ongoing improvements to detection patterns.
For some level of stability,
use one of the machine-readable output formats
and define a B<--shortname-scheme>.

Option B<--deb-fmt> was deprecated since v3.2.
Please use option B<--shortname-scheme>=I<debian,spdx> instead.

=cut

sub version
{
	print <<"EOF";
This is $progname version $VERSION

$COPYRIGHT
EOF
}

=head1 SEE ALSO

Other similar tools exist.

Here is a list of known tools also command-line based and general-purpose:

=over 16

=item L<copyright-update|https://github.com/jaalto/project--copyright-update>

Written in Perl.

=item L<debmake|http://anonscm.debian.org/git/collab-maint/debmake.git>

Written in Python.

Specific to Debian packages.

=item L<decopy|https://anonscm.debian.org/git/collab-maint/decopy.git>

Written in Python.

=item L<Licensee|http://ben.balter.com/licensee/>

Written in Ruby.

=item L<LicenseFinder|https://github.com/pivotal/LicenseFinder>

Written in Ruby.

=item L<ninka|http://ninka.turingmachine.org/>

Written in C++.

Used in L<FOSSology|http://fossology.org/>
(along with Monk and Nomos apparently unavailable as standalone command-line tools).

=item L<ripper|https://github.com/odeke-em/ripper>

Written in Go.