My input file has 100 records like below. Here I need to insert "A" in 5th, 10th 15th........... records but I need to have all records in output. I have to use the Dfsort. let me know if you have any thoughts.
OUTFIL IFTHEN=(WHEN=INIT to assign a one-digit sequence number in an extension to each record. IFTHEN=(WHEN=(logical expression to identify every fifth record and use BUILD=(1,yourlength,/,C'A',yourlength:X), WHEN=NONE for BUILD=(1,yourlength)