Reverse Domain Name

There may be an easier way to do this, but I was in need of a reversed domain-name for another script and this is what I whipped-up. It behaves kinda like rev(1) but with words.

# 1 required argument and one optional argument:
# First argument is the string you want reversed on a word-by-word basis
# Second argument is optional field separator
reverse_words() {
    local out
    IFS=$2
    for word in $1
    do
        [ -n "$out" ] && out="${word}${IFS}${out}"
        [ -z "$out" ] && out="${word}"
    done
    unset IFS
    echo $out
}

for dn in "$@"
do
    result=$(reverse_words "$dn" ".")
    echo $result
done