For example, I have two files. They are not sorted. File1:
apple
banana
pineapple
File2:
pineapple
blueberry
banana
I want to echo fruits that only exist in file1, not in file2. And in this case, it's apple.(even we have pineapple)
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Charles Duffy
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Dave
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Do you need your output to respect the current ordering of items in the files, or is it fine if the output is in sorted order? – Charles Duffy Jun 25 '22 at 15:58
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Also, what do you know about the real-world size bounds? Is it possible for the files to be too large to fit in memory? Too large to have temporary copies made on disk? – Charles Duffy Jun 25 '22 at 15:58
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...mind, in pretty much any case the answer you end up with will be either `comm` or `awk` (in the former case, with transient `sort` invocations for both inputs). – Charles Duffy Jun 25 '22 at 15:59