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       map { $_ => do { local ($/,*F); open F, "<$_" or die 
             "Error reading '$_': $!"; <F> }} glob('*')
...
       
       map{$_=>do{open my $fh,$_ or die"$_:$!";<$fh>}}glob('*')

  package MyPackage; 
      sub make_hash { 
...
     __END__

    foreach $filename (glob('*', '.*')) { 
        open(DF, $filename) or die(); 
...
   #the snippet i mentioned would have had the contents in @{$hash{$fi
+lename}}, 
   #but you would have had to reassemble that back into a single strin
+g, if that is what you needed)