/usr/lib/x86_64-linux-gnu/perl-base/IO.pm is in perl-base 5.26.1-6ubuntu0.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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package IO;
use XSLoader ();
use Carp;
use strict;
use warnings;
our $VERSION = "1.38";
XSLoader::load 'IO', $VERSION;
sub import {
shift;
warnings::warnif('deprecated', qq{Parameterless "use IO" deprecated})
if @_ == 0 ;
my @l = @_ ? @_ : qw(Handle Seekable File Pipe Socket Dir);
local @INC = @INC;
pop @INC if $INC[-1] eq '.';
eval join("", map { "require IO::" . (/(\w+)/)[0] . ";\n" } @l)
or croak $@;
}
1;
__END__
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