Maybe someone need it, too. A small shell script to create hundreds of users and groups:

#!/bin/bash
set -e
export OC_PASS=test12

for ((j=1;j<=30;j++));
do
    for ((i=1;i<=50;i++));
    do
        ./occ user:add pomes_$i-$j --password-from-env -g bdo_$j
    done
done

Thanks @nickvergessen for the occ tip :)

Update 4.4.2017:

- Now with groups

#create #nextcloud #owncloud #user