# Add User to Linux

To add a user to a Linux system use the add user command:

```bash
sudo adduser username
```

To enable sudo privileges for the user, add the user to the sudo group:

```bash
sudo usermod -aG sudo username
```

To setup a ssh key for the user, switch to the user and create the .ssh directory:

```bash
sudo su - username
mkdir ~/.ssh
chmod 700 ~/.ssh
```

Then create the authorized_keys file and add the public key:

```bash
touch ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
vim ~/.ssh/authorized_keys
```

Paste the public key into the file and save it. The user should now be able to log in using the ssh key.

To enable sudo without a password, edit the sudoers file:

```bash
sudo visudo
```

Add the following line to the end of the file:

```bash
username ALL=(ALL) NOPASSWD:ALL
```