open FILE, ">testfile.log" or die "Unable to create file: $!";
close FILE;

if (! -f "*estfile.log") {
	print STDERR "Not a file *.\n";
}

if (! -f "|testfile.log") {
	print STDERR "Not a file |.\n";
}

if (! -f "?estfile.log") {
	print STDERR "Not a file ?.\n";
}

if (! -f "<testfile.log") {
	print STDERR "Not a file <.\n";
}

if (! -f ">>testfile.log") {
	print STDERR "Not a file >>.\n";
}

exit;

__END__
Not a file *.
Not a file |.
Not a file ?.
Not a file >>.