list_dns.sh

#!/bin/bash

# Command-line to list DNS servers used by my system - Ask Ubuntu
# https://askubuntu.com/questions/152593/command-line-to-list-dns-servers-used-by-my-system

DEVICE_NAME="eno1"

# get interface name
interface=$(nmcli device | grep "$DEVICE_NAME" | cut -d' ' -f1)

# list dns
echo DNS of $interface
nmcli -t -f IP4.DNS device show "$interface" | cut -d':' -f2

set_dns.sh

#!/bin/bash

# networking - How to manage DNS in NetworkManager via console (nmcli)? - Server Fault
# https://serverfault.com/questions/810636/how-to-manage-dns-in-networkmanager-via-console-nmcli
#
# 

DNS_IP="1.1.1.1, 1.0.0.1, 8.8.8.8, 8.8.4.4"

DEVICE_NAME="eno1"

# get interface name
interface=$(nmcli -t device | grep "$DEVICE_NAME" | cut -d: -f1)
# get connection name
connection=$(nmcli -t connection show --active | grep "$DEVICE_NAME" | cut -d: -f1)

echo "interface: $interface"
echo "connection: $connection"

# disable auto-dns
nmcli con mod "$connection" ipv4.ignore-auto-dns yes
# show result
nmcli -t -f ipv4.ignore-auto-dns con show "$connection"

# set dns at connection
nmcli con mod "$connection" ipv4.dns "$DNS_IP"
# show result
nmcli -t -f ipv4.dns con show "$connection"


# set dns at interface (take effect immediately)
nmcli dev mod "$interface" ipv4.dns "$DNS_IP"
# show result
nmcli -t -f IP4.DNS dev show "$interface"

set_wifi_on_boot_for_all.sh

#!/bin/bash

# command line - stay connected to wifi when all users log out - Ask Ubuntu
# https://askubuntu.com/questions/1064959/stay-connected-to-wifi-when-all-users-log-out


DEVICE_NAME="wlo1"

# get interface name
interface=$(nmcli -t device | grep "$DEVICE_NAME" | cut -d: -f1)
# get connection name
connection=$(nmcli -t connection show --active | grep "$DEVICE_NAME" | cut -d: -f1)

echo "interface: $interface"
echo "connection: $connection"


# set permissions (for all users)
nmcli connection modify "$connection" connection.permissions ''
# show result
nmcli -t -f connection.permissions con show "$connection"

# set autoconnect
nmcli connection modify "$connection" connection.autoconnect yes
# show result
nmcli -t -f connection.autoconnect con show "$connection"

# set autoconnect-priority
nmcli connection modify "$connection" connection.autoconnect-priority 10
# show result
nmcli -t -f connection.autoconnect-priority con show "$connection"