Convert all file extensions to lower-case

Question

I\'m trying to lower-case all my extensions regardless of what it is. So far, from what I\'ve seen, you have to specify what file extensions you want to convert to lower-cas

Answer 1

If your only interested in certain file extensions like converting all higher case "JPG" extensions to lower case "jpg" You could use the command line utility rename like so. CD into directory you want to change. Then

rename -n 's/\.JPG$/\.jpg/' *

Use -n option to test what will be changed, then when you happy with results use without like so

rename  's/\.JPG$/\.jpg/' *