convert file names from uppercase to lowecase

lowercase_file_name.sh

      #!/bin/sh
       # lowerit
       # convert all file names in the current directory to lower case
       # only operates on plain files--does not change the name of directories
       # will ask for verification before overwriting an existing file
       for x in `ls`
         do
         if [ ! -f $x ]; then
           continue
          fi
        lc=`echo $x  | tr '[A-Z]' '[a-z]'`
       if [ $lc != $x ]; then
          mv -i $x $lc
        fi
        done