Linux命令之ifconfig
1.ifconfig介绍
linux命令ifconfig可以用来查看网卡信息，启停网卡，设置网络IP等，基于实际运维场景，我们就来说说ifconfig普遍的常规用法
2.ifconfig用法
ifconfig [网络设备名称] [参数]
| 参数 | 说明 |
| up | 启动网卡 |
| down | 停止网卡 |
3.实例
3.1.查看网卡信息
命令：
ifconfig
[root@rhel77 ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.169 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::fab1:2705:b2c9:676d prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:01:1c:bf txqueuelen 1000 (Ethernet)
RX packets 363 bytes 33322 (32.5 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 247 bytes 24982 (24.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: 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 (Local Loopback)
RX packets 32 bytes 2528 (2.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 32 bytes 2528 (2.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:bf:ab:54 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 0
[root@rhel77 ~]#
3.2.过滤网卡IP信息
命令：
ifconfig | grep inet | awk '{print $2}' | head -n1
[root@rhel77 ~]# ifconfig | grep inet | awk '{print $2}' | head -n1
192.168.10.169
[root@rhel77 ~]#
3.3.停止网卡
命令：
ifconfig ens33 down
3.4.启动网卡
命令：
ifconfig ens33 up
