# Requires n98-magerun

n98-magerun admin:user:list --format=csv | grep ,active | while read row;
do
     user=$(echo $row | cut -d, -f2)
     pass=$(tr -cd '[:alnum:]' < /dev/urandom | fold -w10 | head -n1)
     echo "$user -> $pass"
     n98-magerun admin:user:change-password $user $pass >/dev/null
done