Looks about the same, as expected as the hash methodology is the same. However the code you have posted does not actually do much, I presume they are typos, but if you tested this code the results dont mean much I'm afraid. In the second while loop you set up @array2 but then refer to @array - which because you do not lexically scope it using 'my' will be set to the last value found in the first while loop. You also do not set $dn so this will always be null. You don't need the else next bit at the end BTW - you do not gain anything from this as you are already at the end of the loop block. I would be interested as to how this code goes if you have time to test it.

while (<XCH0S>) {
    chomp;
    tr/A-Z/a-z/;
    $xch0{(split",")[2]}++;    
}
while (<XCH3S>) {
    chomp;
    tr/A-Z/a-z/;
    my $dn = (split",")[2];    
    print "DN of extra record is: $dn\n" if !defined $xch0{$dn};
}
[download]

cheers

tachyon

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