ifconfig命令
ifconfig - configure a network interface。即，配置网络接口。
ifconfig的用法：
ifconfig [-v] [-a] [-s] [interface]
ifconfig [-v] interface [aftype] options | address ...
实例1，查看eth0网卡信息
[zhangchuangfei@localhost ~]$ ifconfig eth0 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.57.128 netmask 255.255.255.0 broadcast 192.168.57.255 inet6 fe80::5ba:d293:e477:fb7 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:b9:28:b8 txqueuelen 1000 (Ethernet) RX packets 35510 bytes 47597156 (45.3 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 15712 bytes 1117623 (1.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
实例2，以简短的列表显示
[zhangchuangfei@localhost ~]$ ifconfig -s Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 1500 35578 0 0 0 15756 0 0 0 BMRU lo 65536 4 0 0 0 4 0 0 0 LRU
实例3，启用禁用网卡
ifconfig eth0 up ifconfig eth0 down
实例4，配置网卡的信息
[zhangchuangfei@localhost ~]$ ifconfig 192.168.57.129 netmask 255.255.255.0
