thanks, but again have a doubt. I got that my arrays(hashes) have only keys and values are undef. but my flat file is like 1111 2222 3333 4444 which I have loaded into an an hash say %hash1 and I was assuming that with this 1111 and 3333 will become the key for values 2222 and 4444 respectively, but I think I was wrong. So I have two flat files just like the above sample and which I have loaded into two separate hashes say %hash1,%hash2, and if they have any not common values/key then store into another array or hash, does not matter. Please help me out...

In reply to Re^2: How to compare two associative arrays efficiently by viveks_19
in thread How to compare two associative arrays efficiently by viveks_19

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