Apparently, you didn't pass any argument to your script from the Command Line Interface (CLI), when running it.
So, your variable @libfiles is empty, thus, when pass to a scalar variable you get the output "0", when printed.
p @gn; # print  i.e empty
print my $c = () = @gn; ## print 0
So to get the desired result, do this from your CLI:perl script.pl --library=foo,bar,baz
then press <ENTER> key.
using the following as your perl script.
# your script.pl
GetOptions( 'library=s' => \@libfiles );
@libfiles = split( /,/, join( ',', @libfiles ) );
my $LstCnt = @libfiles;
foo bar baz
is not broken after all.
Hope this helps
If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me
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