To change the default linux shell type every time a new user is created, simply modify linux file /etc/default/useradd.
Edit /etc/default/useradd, the default linux shell is explicitly defined. You can change that to suit your needs.
[root@MyLinuxServer ~]# vi /etc/default/useradd
# useradd defaults file
GROUP=100
HOME=/var/www/html "Change default folder user"
INACTIVE=-1
EXPIRE=
SHELL=/sbin/nologin "Not login ssh"
SKEL=/etc/skel
CREATE_MAIL_SPOOL=yes
GROUP=100
HOME=/var/www/html "Change default folder user"
INACTIVE=-1
EXPIRE=
SHELL=/sbin/nologin "Not login ssh"
SKEL=/etc/skel
CREATE_MAIL_SPOOL=yes