diff options file1 file2
|-c||Produce a different output from the standard format (see below)|
|-I||Ignore character cases|
Using the files file1 and file2 from our comm example, diff will output lines that are different between two files.
$ diff file1 file2 2,3c2,3 < The game < Boys in company C --- > The games > The boys in company C
Diff has reported that lines 2 and 3 are different, with the second column in line 3 not matching.