Appending = in particular column in csv file

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http://www.unix.com – Hi, I have a requirement to append = in particular row in csv file. Data in csv is as follow: Code: row1,a,a,a row2,b,b,b row3,c,c,c row4,d,d,d csv should be modified at row3 and no. of columns are not fixed but rows are. output should be as: Code: row1,a,a,a row2,b,b,b row3,=c,=c,=c row4,d,d,d = should be appended after comma. Please help. (HowTos)