Connect to Wi-Fi on GNU/Linux (terminal)

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Date created: Dec 25 2021

Why?

• For everyone who wants to become a cool kid.
• For everyone who loves working with a terminal rather than GUI.
• For everyone who needs to feel how extensibility of the GNU/Linux Operating System.

Commands

Make sure you can run all these commands before you get started.

• rfkill - tool for enabling and disabling wireless devices
• wpa_passphrase - Generate a WPA PSK from an ASCII passphrase for a SSID
• wpa_supplicant - Wi-Fi Protected Access client and IEEE 802.1X supplicant
• ip - show / manipulate routing, network devices, interfaces and tunnels
• iw - show / manipulate wireless devices and their configuration
• dhcpcd - a DHCP client

Main

• First, unlock your wifi device if it’s locked.

sudo rfkill unblock wifi

• Secondly, turn on your wireless interface. In my case, the wireless interface is wlan0. Your wireless interface may look different, like wlp1s0 (predictable network interface). But to know what does it look like, type ip a.

sudo ip link set wlan0 up

• Thirdly, scan for SSID (wifi name) and ask your neighbor what the password is. If it’s your wifi, go to the next step.

sudo iw dev wlan0 scan | grep SSID

• Fourthly, generate a config file, replace your corresponding SSID & password. In my case, SSID is Huynh Van Tai, and the password is hanxinhdep.

wpa_passphrase "Huynh Van Tai" "hanxinhdep" > xxx.conf

• Fifthly, connect to Wi-Fi using the config file

sudo wpa_supplicant -c xxx.conf -i wlan0 & disown

• Finally, get the IP address & other things with the DHCP client.

sudo dhcpcd wlan0

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