#! /bin/bash

for i in seq -w 11 20;doid user$i &> /dev/nullretal=$? if [ $retal -ne 0 ];then useradd user$i &>/dev/null echo echo $RANDOM123|md5sum|cut -c 1-10| passwd --stdin user$i &> /dev/nullecho "useradd have created."elseecho "this users exists."fi done