I've been trying to match and extract information from a flat text file. (CGI). The script is as follows:

#!/usr/bin/perl -w
use strict;
#use CGI::Carp qw(fatalsToBrowser warningsToBrowser);
use CGI ':standard';


my  $data="/path/data.txt";
my  $other_data="/path/other_data.txt";
 

my $checkfour = param('check');
my @other = ();


open (OTHER, $other_data);

while (my $line =<OTHER>) {
    my ($one,$two,$three,$four,$five) = split "\t",$line;
     if ($four eq $checkfour) { 
     push (@other, $three);
     push (@other, $four); 
     last;  
    }
}
close (OTHER);

my $checkthree = shift(@other);
my $four = shift(@other);


print header(), start_html(-title => "");

print "get $checkthree and $four then $checkfour<br>";

open (FILE, "$data");
while (my $line =<FILE>) {
    my ($one,$two,$three,$four,$five) = split "\t",$line;
    if ($three eq $checkthree) {
    
print "<p>With matching parameters I should be able to see this </p>";
last;
} else {print "<p>If I put the else statement in it ignores the fact t
+hat the parameters match - and comes here!  (But I don't know why).</
+p>";
              last;
              }
}
    
close FILE;
print end_html();
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If the input in $checkfour matches the field $four then I can take out the information. If it doesn't match the 'else' kicks in.

Except.....when I use parameters that do match, it matches only if the else statement is not there - if take it out I get the match, if I put it in it ignores the match and goes to the else.

If someone could tell me why I'd be very grateful.