Got it so far.

open CHECKFILE, "< file.in" or die qq(Cannot open file "file.in": $!);
        @filecontent = <INFILE>;
        foreach $line (@filecontent) {
                print " $line";
        }
close (INFILE);


The input file (list of files) looks something like this:

  P: 1          N: 11222
  P: 2          N: 22333
  P: 3          N: 33444
  P: 4          N: 44555

How can I output just from the above code?

11222
22333
33444
44555







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