in reply to Use of uninitialized value in concatenation (.) or string at perl.pl line 216, <$file> line 18.

If you use autodie you won't have to add or die or get confused about which variable contains the filename (which, FWIW, we discussed this on december 3rd) :) 
use autodie;
open my $file , '<', $options{c};
my @files = <$file>;
close $file;

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