Rename files from MM-DD-YYYY to YYYY-MM-DD

redate.sh

#!/bin/bash

for file in `ls -1 | grep -e "[0-9]\{2\}-[0-9]\{2\}-[0-9]\{4\}" ` ; do
    if [[ $file =~ ([0-9]{2})-([0-9]{2})-([0-9]{4})(.*)$ ]] ; then
        newname=${BASH_REMATCH[3]}-${BASH_REMATCH[1]}-${BASH_REMATCH[2]}${BASH_REMATCH[4]}
        echo "$file -> $newname "
        mv -i $file $newname
    else
        echo Skipping $file...
    fi
done