I have a file where the below line is for 4000 times, with some others lines also.:32A:151021JPY301,I need to replace the first occurrence of this to  :32A:151021JPY5000,  and then subsequent occurrence incrementing by 60 at the end. That means output will be,:32A:151021JPY5000,:32A:151021JPY5060,:32A:151021JPY5120,....Please help me to do this.
Increment perticular field by 100
shell script