hi,
am new to unix can any one help me to insert data to afile to a specified
column.

ie to an output file with csv format i should insert some data to 2,3,4 fileds and the data in those fields should move to next fields

eg:
output file

asd,12,12,12,12,1,2,1,1,1,1,1
mnmn,1,12,1,1,1,112,12,1,1,1


insert data

after asd 33,44
after mnmn 55,66


ie required o/p

asd,33,44,12,12,12,12,1,2,1,1,1,1,1
mnmn,55,66,1,12,1,1,1,112,12,1,1,1