ucase

In Großbuchstaben umwandeln

#!/bin/sh 
#
for file in $(ls -A); do 
mv $file $(echo $file | tr [a-z] [A-z]); done

lcase

In Kleinbuchstaben umwandeln

#!/bin/sh 
 
for file in $(ls -A); do 
mv $file $(echo $file | tr [A-Z] [a-z]); done