Auto rotate photos and save them afterwards (perhaps using Preview?)
I came across a binary called "nconvert". I copied these to /usr/local/bin. I then created a simple recursive shell script to go through the folder and subfolders and convert any photo that needs converting.

#!/bin/sh

function recursion {
    if [ $(find . \( -iname "*jpeg" -or -iname "*jpg" \) -maxdepth 1 -type f | wc -l) -gt 0 ]; then
        _fullpath=`pwd`
        echo "Processing $_fullpath"
        echo "Processing $_fullpath" &gt; $HOME/logs/recursive-autorotate-photos.log
        nconvert -jpegtrans exif -overwrite *.jpg
    fi

    for _item in *; do
        if [ -d "$_item" ]; then
            (cd "$_item"; recursion)
        fi
    done
}

if [ ! -z "$1" ]; then
    if [ ! -d "$HOME/logs" ]; then
        mkdir "$HOME"/logs
    fi
    echo "" &gt; $HOME/logs/recursive-autorotate-photos.log

    cd "$1"

    recursion
else
    echo "Usage: recursive-autorotate-photos.sh path-here"
fi


sample: # recursive-autorotate-photos.sh "/Volumes/my-external-disk/photos"

take note of the quotes in the path. if there's a space in the path, there you need to enclosed it in double quotes. I always use double quotes now out of habit.