$file0 is not blank. It contains \n. Just use chomp to remove the newline before checking if the variable is "empty".
my $file = <STDIN>;
chomp($file);
$file ||= "somelist";
The above will also use the default if 0 (zero) is entered. The following avoids that problem:
my $file = <STDIN>;
chomp($file);
$file = "somelist"
if not length $file;
By the way, you really, really, really should use use strict; and use warnings;.
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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