changing file extensions using sed command in linux

I wanted to change all of the files extensions in a folder to .jpg using only sed command.

I tried using

sed -i 's/\.*/\.jpg/g' ~/cw/ 

cw is my folder where i have files like:

• cat.jpg

• dog.JPG

• frog.jpeg

etc.

>Solution :

Using sed

sed -n 's/\(^[^.]*\.\)[jJ][pP]e\?[gG]/mv & \1jpg/p' <(find ~/cw/)

If the dry run indeed changes the files to the expected extension, then you can then execute the command within the sed command

sed -n 's/\(^[^.]*\.\)[jJ][pP]e\?[gG]/mv & \1jpg/pe' <(find ~/cw/)