batch rename with id shifting?
Solution 1:
constant=42
for f in *.txt; do # choose your pattern as appropriate.
IFS='-.' read id suffix ext <<< "$f"
newname="$(( 10#$id + constant ))-yyy.$ext"
echo mv "$f" "$newname"
done
I added "10#" in the arithmetic expression to ensure the number is treated as base-10 even if it begins with a zero.
If this doesn't meet your needs, please provide more requirements in the question.