Ever tried to rename a bunch of files? What's so easy in Windows won't work with the standard
mv doesn't like wildcards and refuses to rename multiple files.
The solution is
# dry run/just show what would be done: rename -n 's/\.JPG/\.jpg/' *.JPG # rename all files in the current directory with a ".PNG" ending to ".png": rename 's/\.PNG/\.png/' *.PNG