On the latest versions of the Arch Linux installation medium, the Wi-Fi connection is set up as follows:
We launch the utility allowing to establish the wireless connection:
iwctl
Once in iwctl, we list the available Wi-Fi cards:
device list
After, once the correct Wi-Fi card is identified (in our example, wlan0), we scan for available network and list them:
station wlan0 scan
station wlan0 get-networks
Finally, to connect to your network:
station wlan0 connect NETWORK-SSID
To leave iwctl, we simply enter:
exit
Note: It can be necessary to "unblock" the network card that we want to use. It is the case, for example, if we notice that our card has the "Powered" property set to "OFF".
If it's the case, we get out of iwctl and we list the network interfaces with the following command:
rfkill list
If the network card is soft-blocked, it is possible to unblock it with the following command (for the wlan interface, to change depending on the card you want to unblock):
rfkill unblock wlan
If you are using a proxy server, you only need to enter the following line by completing it with the correct values. Thanks to Nicolas for the info :)
export http_proxy=http://proxy:port/
A suggestion from Dolorem: if you want to use SSH, here is the process. We start by setting a superuser password:
passwd
To get the local IP:
ip a
We launch the SSH service:
systemctl start sshd
You can now connect in SSH to your machine.