#!/usr/bin/perl

use strict;
use warnings;

use File::Copy;

my ($src, $dest1, $dest2) = ("/tmp/f1", "/tmp/f2", "/tmp/f3");

# Create source file, give it execute permission.
open my $fh, "> $src" or die;
close $fh or die;
chmod 0755, $src or die;
die "No execute permission on source\n" unless -x $src;

# Make sure destination files are removed.
if (-f $dest1) {unlink $dest1 or die;}
if (-f $dest2) {unlink $dest2 or die;}

# Set umask.
umask 022 or die;
system "cp $src $dest1" and die;
die "Lost execute permission using 'system cp'\n" unless -x $dest1;

copy $src, $dest2;
die "Lost execute permission using 'File::Copy'\n" unless -x $dest2;

__END__
Lost execute permission using 'File::Copy'