The Input file is fixed format.The input file 20th character contains any numeric field. I need to change the 20th field to '2'. Then the modified record will be writing in to output file with same format.
If you're not familiar with DFSORT and DFSORT's ICETOOL, I'd suggest reading through "z/OS DFSORT: Getting Started". It's an excellent tutorial, with lots of examples, that will show you how to use DFSORT, DFSORT's ICETOOL and DFSORT Symbols. You can access it online, along with all of the other DFSORT books, from: