If you know what the longest the last line in the file is, this can work nicely. You do the seek as above and then put the rest of the file in an array, here is an example:

my @data; # Store the last part of the file
my $length = -10; # enter the longest length of the last line (and add
+ a few bytes to it), then negate it
open (F,"test") || die "Can't open file"; # open the file or die
seek (F,$length,2); # Go back $length
@data = <F>; # Get the rest of the file in @data
print $data[$#data]; # Print the last line
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Hope this helps.