放弃 ifconfig，拥抱 ip 命令

复制$ ifconfigeth0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether bc:ee:7b:5e:7d:d8 txqueuelen 1000(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 0lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000(LocalLoopback) RX packets 41 bytes 5551(5.4KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 41 bytes 5551(5.4KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.1.1.6 netmask 255.255.255.224 broadcast 10.1.1.31 inet6 fdb4:f58e:49f:4900:d46d:146b:b16:7212 prefixlen 64 scopeid 0x0<global> inet6 fe80::8eb3:4bc0:7cbb:59e8 prefixlen 64 scopeid 0x20<link> ether 08:71:90:81:1e:b5 txqueuelen 1000(Ethernet) RX packets 569459 bytes 779147444(743.0MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 302882 bytes 38131213(36.3MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 01.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.