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If both file1 and file2 are already sorted:
comm -13 file1 file2 > file-new
There are 3 alternatives - vote for the best!
This command compares file2 with file1 and removes the lines that are in file1 from file2. Handy if you have a file where file1 was the origional and you want to remove the origional data from your file2.
If you can do better, submit your command here.
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