Works great. Fixed minor bug in your first open and added code to test to see if the file has been rotated. I think this will work well. Much better than my original idea of comparing the first line of the files. I simply test to see if the old end of file seek is larger than the new end of file seek.

thanks much for the assist 

{
        # get end of log file
        open(LOG, "<$LOG") or die "Can't read $LOG: $!";
        seek(LOG, 0, 2);  # jump to the EOF
        $new_seek = tell(LOG);
        close LOG;
        # get last known position of EOF
        if (open(SEEK, "<$OutputDir/$NAME/last_seek")) {
                $seek = <SEEK>;
                chomp $seek;
                close SEEK;
        }
        else { # no EOF recorded, find it
                # warn "Failed to read seek: $!\nCreating\n";
                &write_seek($new_seek);
                exit;
        }
        if ($seek > $new_seek) { # New Log File
                $seek = 0;
        }               
        open(LOG, "<$LOG") or die "Can't read $log: $!";
        seek(LOG, $seek, 0); # jump to the last EOF
        while (<LOG>) {
                $id = (split / /)[2];
                $login_id{$id}++;
        }
        $seek = tell(LOG);
        &write_seek($seek);
        close LOG;
        @Result = keys %login_id;
        print "USERS=$#Result\n";
}

sub write_seek {
        my $seek = shift;
        open(SEEK, ">$OutputDir/$NAME/last_seek") or die "Can't write 
+to seek: $!";
        print SEEK $seek;
        close SEEK;
}

[download]

In reply to Re: (z) Re: tracking unique users in a weblog by Earindil
in thread tracking unique users in a weblog by Earindil

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.