I have an input file having 7 fields delimited by ,
eg :
1,ABC,hg,1,2,34,3
2,hj,YU,2,3,4,
3,JU,kl,4,5,7,
4,JK,KJ,3,56,4,5
The seventh field here in some lines is empty, whereas the other lines there is a value.
How do I insert string NULL at this location (7th loc) for these lines where output will look like
1,ABC,hg,1,2,34,3
2,hj,YU,2,3,4,NULL
3,JU,kl,4,5,7,NULL
4,JK,KJ,3,56,4,5