/usr/share/doc/rename/examples/rename.pl is in rename 0.20-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | use strict;
use File::Rename ();
@ARGV = map glob, @ARGV if $^O =~ /Win/;
File::Rename::rename @ARGV, { _code => sub { $_ = lc }, verbose => 1 };
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