linux 中如何打印所有网络接口

ifconfig

ifconfig 是最简单最常用，但是打印信息太多了

$ ifconfig
cni0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
        inet 10.244.0.1  netmask 255.255.255.0  broadcast 0.0.0.0
        ether 9e:f3:9e:47:9d:55  txqueuelen 1000  (Ethernet)
        RX packets 14733665  bytes 1007493238 (960.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 15040396  bytes 4534954611 (4.2 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.18.0.1  netmask 255.255.0.0  broadcast 172.18.255.255
        ether 02:42:09:fe:1d:e5  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

netstat

netstat 与 ip 也挺好用，特别是它们还可以打印路由表

$ netstat -i
Kernel Interface table
Iface             MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
cni0             1450 14733471      0      0 0      15040202      0      0      0 BMRU
docker0          1500        0      0      0 0             0      0      0      0 BMU
eth0             1500 42833038      0      0 0      40961577      0      0      0 BMRU
flannel.1        1450  4761436      0      0 0       4091581      0      0      0 BMRU
lo              65536 376447249      0      0 0      376447249      0      0      0 LRU
veth2052e2d6     1450  7358995      0      0 0       7518642      0      0      0 BMRU
veth3190806e     1450  7363232      0      0 0       7510100      0      0      0 BMRU

ip

$ ip link

$ ip addr