Mac lower case all files and folder recursively

# lower case all files in current dir & subdirs
for d in ./**/ ; do (cd "$d" &&  for x in ./*/ ; do (cd "$x" && for f in *; do mv "$f" "$f.tmp"; mv "$f.tmp" "`echo $f | tr "[:upper:]" "[:lower:]"`"; done); done); done

#list all directories
for f in ./**/ ; do echo $f; done

# lower case all files in a directory
for x in ./*/ ; do (cd "$x" && for f in *; do mv "$f" "$f.tmp"; mv "$f.tmp" "`echo $f | tr "[:upper:]" "[:lower:]"`"; done); done