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Originally Posted by szboardstretcher
Have you looked at the man page of 'sort'?
Yes. In fact, I have it as an icon on my Ubuntu desktop. The syntax is daunting. I wonder why there is a --unique option but not a complementary --notunique option. Technical intuition suggests that the logic which identifies uniques and keeps them could just as well identify duplicates and keep them.
The uniq command can print out all the duplicate lines and discard the rest. Moreover it has an option to skip the first N fields. What would be useful is an option to compare only the first N fields. Due to its absence, here is a workaround:
rev file | uniq -f1 -D | rev
As previously noticed, you have a double post with quite the same question. I'm going to close that one and keep this open for further discussion.