参考 nmcliコマンド説明・英文
https://www.freedesktop.org/software/ModemManager/man/1.14.0/mmcli.1.html

備忘

状態を参照

$ nmcli connection show
NAME                UUID                                  TYPE      DEVICE
eth0-s              d24efc82-c622-4a25-afe1-9b11832ad2ed  ethernet  eth0
lo                  700f3868-a17f-452f-b4cb-611708033401  loopback  lo
wifi-wlan0          056ee7a8-3a00-4bfc-902a-7534472d479c  wifi      wlan0
Wired connection 1  e28a7cca-8daf-3c89-9286-fe736ca0432b  ethernet  --

$ nmcli connection show eth0-s
connection.id:                          eth0-s
connection.uuid:                        d24efc82-c622-4a25-afe1-9b11832ad2ed
connection.stable-id:                   --
connection.type:                        802-3-ethernet
以下略

$ nmcli device
DEVICE         TYPE      STATE                   CONNECTION
eth0           ethernet  connected               eth0-s
lo             loopback  connected (externally)  lo
wlan0          wifi      connected               wifi-wlan0
p2p-dev-wlan0  wifi-p2p  disconnected            --

$ nmcli device show eth0
GENERAL.DEVICE:                         eth0
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         B8:27:EB:C8:15:09
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     eth0-s
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/4
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.213.81/24
IP4.GATEWAY:                            --
IP4.ROUTE[1]:                           dst = 192.168.213.0/24, nh = 0.0.0.0, mt = 100
IP6.ADDRESS[1]:                         2402:6b00:de24:3700:2b5d:1bc9:46ea:3701/64
IP6.ADDRESS[2]:                         fe80::a319:8e72:547:7b81/64
IP6.GATEWAY:                            fe80::1266:82ff:fec0:3404
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 1024
IP6.ROUTE[2]:                           dst = 2402:6b00:de24:3700::/64, nh = ::, mt = 100
IP6.ROUTE[3]:                           dst = ::/0, nh = fe80::1266:82ff:fec0:3404, mt = 100
IP6.DNS[1]:                             2402:6b00:de24:3700:1266:82ff:fec0:3404

接続設定を有効化

sudo nmcli connection reload 
sudo nmcli connection up 接続名

接続を停止

sudo nmcli connection down 接続名

接続設定を削除

sudo nmcli connection delete 接続名

リンク

https://qiita.com/Saito5656/items/51502ff6b15a0411452c
https://densan-hoshigumi.com/server/centos-nmcli-operation
https://milestone-of-se.nesuke.com/sv-basic/linux-basic/nmcli/
https://qiita.com/tatsuya-k_net/items/e37fa463e51d1726a60c
https://endy-tech.hatenablog.jp/entry/2019/01/14/012743
https://access.redhat.com/documentation/ja-jp/red_hat_enterprise_linux/7/html/networking_guide/sec-configuring_ip_networking_with_nmcli
https://access.redhat.com/documentation/ja-jp/red_hat_enterprise_linux/9/html/configuring_basic_system_settings/configuring-an-ethernet-connection-by-using-nmcli_assembly_configuring-and-managing-network-access
https://raspida.com/networkmanager-wifi-ap