(base) root@57beff3260ef:~# sudo su - test $ exit (base) root@57beff3260ef:~# apt-get install zsh
(base) root@57beff3260ef:~# echo $SHELL /bin/bash (base) root@57beff3260ef:~# chsh -s /bin/zsh
useradd -d /home/portal -s /bin/bash -g users -m portal