#!/bin/sh

if [ $# -eq 0 ] || [ "$1" = "-h" ] ; then
    cat<<EOF
Usage: ${1##*/} FILES

Rename FILES to lowercase.

EOF

    exit
fi

for FILE ; do
	FILENAME=${FILE##*/}

	case "$FILENAME" in
	    */*) DIRNAME="${FILE%/*}" ;;
	    *) DIRNAME="." ;;
    esac

    NF="$(echo $FILENAME | tr '[:upper:]' '[:lower:]')"
    NEWNAME="${DIRNAME}/${NF}"
    if [ "$NF" != "$FILENAME" ]; then
        if [ -e "$NEWNAME" ]; then
            echo >&2 "$NEWNAME already exists, not overwriting."
        else
	        mv "$FILE" "$NEWNAME"
	        echo "'$FILE' '$NEWNAME'"
        fi
    fi
done