Having worked with a lot of fixed-length data (Fortran output), I've done it like this: 
#!/usr/bin/perl
use strict;
use warnings;

<DATA>; <DATA>;    # skip header lines

while (<DATA>) {
    my @fields = / (.{51}) (.{21}) (.{21}) (.{21}) (.+) /x or next;
    my @fields_nospace = map {/^\s*(.+?)\s*$/; $1} @fields;
    print join ("\t", @fields_nospace), "\n";
}

__DATA__
(your data here)

[download]
Output: 
N-20070143.003.TXT      05/23/07 02:36:59 PM    13      13      0
N-20070143.004.TXT      05/23/07 04:48:56 PM    1       1       0
N-20070143.006.TXT      05/23/07 04:48:56 PM    16      16      0
N-20070143.008.TXT      05/23/07 04:48:58 PM    19      19      0
N-20070143.009.TXT      05/23/07 04:48:59 PM    1       1       0
N-20070143.010.TXT      05/23/07 04:49:00 PM    5       4       1
N-20070143.012.TXT      05/23/07 04:49:00 PM    18      18      0
N-20070143.013.TXT      05/23/07 04:49:02 PM    20      20      0
N-20070143.015.TXT      05/23/07 04:49:03 PM    53      53      0
N-20070143.011.TXT      05/24/07 04:35:48 PM    5       5       0
N-20070152.040.TXT      06/18/07 04:03:26 PM    25      21      4

[download]

In reply to Re: How to monitor a logfile with columns for certain data? by gamache
in thread How to monitor a logfile with columns for certain data? by freddiel

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