How to set file extension in bash variable?

Question

bash

There is such a script that changes the scale of the picture and replaces the original with it.
convert -resize 49.6% "$file" "$file"
I want every file modified by this script to have a .jpg file extension (not jpeg, jpg, jpeg like the originals have). How to do it?

Answer 1

Maybe,
convert -resize 49.6% "$file" "${file/%\.*/.jpg}"