How could I compare two files and remove similar rows in them (bash script)

Question

I have two files of data with similar number of columns. I\'d like to save file2 in another file (file3) while I exclude the rows which are existed already in the file1.

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Answer 1

You can convert tabs to spaces on the fly:

grep -vif <(tr '\t' ' ' < file1) file2 > file3

This is process substitution.