merge-file

Using sed to combine multiple csv files

I have 3 csv files I'd like to combine. Each file has 3 comma delimited columns. File 1 has columns a,b,c File 2 has columns d,e,f File 3 has columns g,h,i I'd like to combine the 3 files into a single file of: a,b,c,e,f,h Can I use sed to do that? I could write a console app or script easily enough but I'm attempting to get some...