Raw Input		Desired Output
12399 4579 999 47		12400 4580 1000 48

Script and Comments

Script₁

[ 1] s/.9*$/\n&/
[ 2] h
[ 3] y/0123456789/1234567890/
[ 4] G
[ 5] s/.*\n\(.*\)\n\(.*\)\n.*/\2\1/
[ 6] s/^0/10/

Comments

An integer can be splitted into two parts:
- Part B: consists of digits that will by changed by the increment operation
- Part A: consists of other digits
For example:

Number A B
12399 1 2399
4579 45 79
999 999
47 4 7
Step [1] will split a number into two parts and add a newline character between them.
Step [2]: command 'h' will copy the contents of Pattern Space to Hold Space.
Step [3] is used to simulate 'increment by 1': replace 0 with 1, 1 with 2, ..., and 9 with 0.
Step [4]: command 'G' will append the original copy (saved by Step [2]) at the end of Pattern Space, separated by a newline character.
Now PS contains: A' \n B' \n A \n B. where A' and B' are transformed from A and B, respectively, by Step [3]. Only B' is useful.
Step [5] will make PS be A B'.
Step [6] will prepend '1' if PS begins with '0'.