Script for Automator to reorder text in file/folder name.

Question

I have a folder full of pictures named by their first and last names. I need them to be renamed by listing them by last name first, first name last in order to get them alphabatized properly. Anybody out there have a nice Automator script for me to make this happen? I'm new.
Looking for it to look like this:
Brown, John

Answer 1

Try this (should work for "John H Smith" --> "Smith John H" as well):
The Run Shell Script Action is:
for f in "$@"
do
    basename=${f##*/}
    path=${f%/*}
    ext=${f##*.}
    name=${basename%.*}
    if [[ "$name" =~ \  ]]; then
        fname=${name% *}
        lname=${name##* }
        name="$lname $fname"
        mv "$f" "$path/$name.$ext"
    fi
done
If you want a comma, then change: name="$lname $fname" to name="$lname, $fname"
As with all scripts, back-up the files before running