# How to add groups to a system?


You can check the manual of the ``groupadd`` command in the terminal with `man groupadd`.

This article goes hand in hand with the User Creation Article.

Typically, a dedicated group is required for read and write access to your private EO-Storage. We will provide you a group ID in our welcome e-mail. After creating a VM, you will need to create the group separtely on each VM. Afterwards all users that shall have access to your private EO-Storage must be added to the group. 


### Create a group
To create a group, use the `groupadd` command:
`groupadd -g GROUP_ID group_name`

Example using group ID 5000:
`groupadd -g 5000 group_name`

### Add a user to the group
Often used flags are `-a` (append) and `-G` (group).
This tells `usermod` we are appending to the group name that follows the option.

```bash
ubuntu@eodc:~$ sudo usermod -aG sudo your_user
ubuntu@eodc:~$ sudo usermod -aG group2,group3,group4 your_user
```

You can check the user groups with the `id` command

```bash
ubuntu@eodc:~$ id your_user
```