can't see the point of having this line: system("clear"); maybe you need a chdir instead?

...And this is not correct because you need to define the variable first

chomp $fileName;
my $fileName = <STDIN>;
[download]

Better like this:

my $fileName = <STDIN>;
chomp $fileName;
[download]

You can use also a more compact form saving one line. Parens are required:

chomp (my $filename = <STDIN>);

What is "the correct file" for you? all files in the CD?