# Linux basics

## User and group management

### Add user to group

```bash
sudo usermod -a -G GROUP_NAME USER_NAME
```

- `-a` **append** add user to group, otherwise the user will be removed from any groups, not in the list.
- `-G` comma-separated list of additional groups to assign the user to.

## Networking

### IP

List networki adapters

```bash
ip link
```

Enable/disable netwokr adapter

````{tabs}
```{code-tab} bash template
sudo ip link set <ADAPTER_NAME> up/down
```

```{code-tab} bash example
sudo ip link set eth0 up
```
````

Set IP address for adapter

````{tabs}
```{code-tab} bash template
sudo ip addr add <IP_ADDRESS>/<NETMASK> dev <ADAPTER_NAME>
```

```{code-tab} bash example
sudo ip addr add 192.168.7.10/24 dev eth0
```
````