You're absolutely right. your code is matches exactly what I'm looking for however, not getting the result I suspect. so here's the output after executing what  you listed.
 
<snip>
 
 
00e06f16b25 41000 306000 00112f9486bf 412 1696
 
</snip>
 
what I'm looking for is searching for this value 00e06f16b25 and match with file2, than take both matching lines from file1 and file2 and merge it to file3. so the result should be:
 
00e06f16b25 41000 306000 00e06f16b25 389 5000

In reply to Re^2: Dealing with large files in Perl by tester786
in thread Dealing with large files in Perl by tester786

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