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> my @x = <FH>;
> @x = @x[($#x-100>0?$#x-100:0)..$#x];

open LOG,"<","/some/log" or die $!;
seek LOG,-50000,2;  # go to 50K from the end (assuming your log-lines 
+have 500 or less characters)
...
close LOG;

print @lines;

-- 
Joost       downtime n. The period during which a system
            is error-free and immune from user input.