Git add not working with .png files?

Question

I have a dirty working tree, dirty because I made changes to source files and touched up some images. I was trying to add just the images to the index, so I ran this command

Answer 1

git ls-files is a good way to list everything in your git repo

For your case you can do something like

git ls-files --modified | grep '\.png$' | xargs git add

List the modified files, filter by extension (.png in this case) and git add the resultant entries