Dear monks, After a long time, I seek your wisdom once again!

I have two big input files of about 1.5 million rows each (each rows actually consists of a unique ID number). Lets call them file#1 and file#2. The vast majority of these ID numbers occurs one time in BOTH these files and some ID number are exclusive to file#1 OR file#2 only.

What I want to do is to produce an output of three files: 1) one file with IDs occurring in both input files, 2) one file containing IDs unique to file#1 and 3) one file containing IDs unique to file#2.

I mean... I know how to write the code to do this kind of stuff, but its taking forever the way I wrote it. Its the first time I have to deal with huge files like this... Anyone have a suggestion for an efficient implementation for this kind of task?

In reply to Help for finding duplicates in huge files by julio_514

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