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.

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

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