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I don't think diff (even in combination with cut) will be flexible enough to handle this. And it seems as though what you really want is keys in file1 that are not in file2 and vice versa - not strictly a line-by-line diff. If the input files are big, I would go with perl, but for small files this awk script works for the input provided: %cat a.awk BEGIN ...


awk is a better tool for comparing columns of files. See, for example, the answer to: compare two columns of different files and print if it matches -- there are similar answers out there for printing lines for matching columns. Since you want to print lines that don't match, we can create an awk command that prints the lines in file2 for which column 2 has ...

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