# How to add users to a system?

The command used to create a new user is called `useradd`.

Just by running `useradd your_user` a new user named your_user will be created, but you probably want to add some parameters.
The options of the `useradd` command are:
- `-m` This will create a home directory in `/home/your_user`
- `-G group_name` will add the newly created user to the here specified groups (`wheel` is an often used group since it allows the user to use `sudo`)
- `-s path/to/shell` changes the default shell of the user. The available shells and their paths can be checked with `cat /etc/shells`. If the shell you want to use is not available it can be installed using the OSs package manager.

# Modifying an existing user
In case you forgot to set something when creating the user, you can do that afterwards using the `usermod` command.

- `-aG` to add another group to a user
- `-s` to change the users default shell

For any additional options you might want to know you can always check the man pages using `man usermod` or any other command.