The useradd command is used to add new users on your Linux system. But it can be used for other things too.
You may display the defaults for new users.
jason-H55-USB3% sudo useradd -D GROUP=100 HOME=/home INACTIVE=-1 EXPIRE= SHELL=/bin/sh SKEL=/etc/skel CREATE_MAIL_SPOOL=no |
Use the -s parameter to useradd and this will change the default shell for new users.
sudo useradd -D -s /bin/sh |
Very easy indeed.