Most full-featured modern Linux distributions have graphical ways of managing users. And you certainly won't need to manage any users on the McKelvey Cluster. But it's worth having here as a reference.

useradd 

useradd creates a user. You can customize certain things. The -m flag creates a home directory. You can update what a default home directory looks like in the folder /etc/skel . For instance if you want all new users to have a Downloads folder, a Documents folder, and a Coding folder. You can use mkdir /etc/skel/{Downloads,Documents,Coding } to create the directories, then useradd -m newuser .

You can use man useradd to see all of the options.

usermod 

usermod  functions almost identically to useradd  but it changes settings on already existing users. So if you want to change your shell from bash to zsh, you can use usermod -s /bin/zsh myuser .

One thing that is important to keep in mind is that any attribute you set will completely overwrite the previously existing attribute. For instance, if myuser  is in the wheel group giving them sudo  privileges, and you want to add them to the docker  group because you are starting to use docker , you might run usermod -G docker myuser . The problem with this is that myuser will be removed from the wheel  group and added to the docker  group removing their sudo  privileges. The way to avoid this is to use the -a  flag to "append" the new attribute to the old one. For example usermod -a -G docker myuser  will just add myuser to the docker group and not remove them from anything.