/usr/share/perl5/App/CLI/Helper.pm is in libapp-cli-perl 0.313-1.
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 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | package App::CLI::Helper;
sub import {
  my $caller = caller;
  for (qw(commands files)) {
    *{$caller."::$_"} = *$_;
  }
}
=head3 commands()
=cut
sub commands {
    my $class = shift;
    my $dir = ref($class) ? ref($class) : $class;
    $dir =~ s{::}{/}g;
    $dir = $INC{$dir.'.pm'};
    $dir =~ s/\.pm$//;
    return sort map { ($_) = m{^\Q$dir\E/(.*)\.pm}; lc($_) } $class->files;
}
=head3 files()
return module files of subcommans of first level
=cut
sub files {
    my $class = shift;
    $class = ref($class) if ref($class);
    $class =~ s{::}{/}g;
    my $dir = $INC{$class.'.pm'};
    $dir =~ s/\.pm$//;
    return sort glob("$dir/*.pm");
}
1;
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