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# Top level
my $choice = get_choice();
...

# Even lower level
...

my $ret = system "`xcopy "C:\\Program Files\\UltraVNC\\*.*" "\\\\$ip\\
+C\$\\Program Files\\UltraVNC\\*.*" /r/i/c/h/k/e/Y";
die "xcopy failed" if $ret;
$ret = 0;
...

open(DAT,">>$resultOutput") || die("Cannot Open File");
print DAT "Bad username or password on the following machines:\n";

open DAT, ">>$filename" || die "foo";

open DAT, (">>$filename" || die "foo");

open(my $dat, ">>", $resultOutput")    or die("Cannot Open File");
print $dat "Bad username or password on the following machines:\n";