Hi Soonix, I am not understood most of the syntax stated. Is that meant that you still in Perl but you are calling SQL type of structure? Also, I tried to copy your code and run in command prompt. However, I only able to get one line of output as below.  wl,bl,die1,die_2 Could you guide me on the coding side if I wish to modify this script to able open 2 input files name "Die1.txt" and "Die2.txt". Then let it extract all the 8 millions of line from both file and output to the "CombineDie1Die2.txt". Appreciate if you could explain the logic too.

In reply to Re^2: Solve the large file size issue by Anonymous Monk
in thread Solve the large file size issue by Vkhaw

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