Re^3: Have a multiple file in directory and want to manipulate in each files in incremental order. All the file have same value.

What did you expect to happen as a result of these lines?

  open my $in_fh, '<',$file; 
  my @lines = $file;
  close $in_fh;
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If you expected that the contents of the data file would be read into the @lines array, the second line should be:

  my @lines = <$in_fh>;
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The way you posted it, you're just assigning the file name (value of $file) to be the first element of @lines, and nothing else is placed into the array. That's why you got "use of uninitialized value" when you tried to do something with the second element of the array.

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