Ubuntu - Patch Diff merge issue

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http://askubuntu.com – i have two text files test1.txt and test2.txt with content as test1.txt 1 2 test2.txt 1 2 3 4 what i have achieved with the txt files is a difference of both files in a third file as diff test2.txt test1.txt > test.patch patch test.txt < test.patch in text.txt i have the resultant difference of both files. Now i am doing the same with CSV files. The format for CSV files is like HENRY CONSTANTINE | 02256 | MEDICAL | Speciality diff small2.csv small1.csv > small.patch patch small.csv < small.patch *Note: I have created the small.csv file manually. (HowTos)