Question

我机器中ifconfig的输出如下：

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
    ether 3c:a8:2a:22:64:dc  txqueuelen 1000  (Ethernet)
    RX packets 7574600  bytes 945219457 (901.4 MiB)
    RX errors 0  dropped 10  overruns 0  frame 0
    TX packets 0  bytes 0 (0.0 B)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    device interrupt 16

eth1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 3c:a8:2a:22:64:dd  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
        device interrupt 17

eth2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.25.26.78  netmask 255.255.254.0  broadcast 10.25.27.255
        inet6 fe80::8edc:d4ff:feab:48a0  prefixlen 64  scopeid 0x20<link>
        ether 8c:dc:d4:ab:48:a0  txqueuelen 1000  (Ethernet)
        RX packets 1459110828  bytes 2115198897739 (1.9 TiB)
        RX errors 0  dropped 32460  overruns 0  frame 0
        TX packets 1527389441  bytes 2229468090451 (2.0 TiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth3: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 3c:a8:2a:22:64:de  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
        device interrupt 16

eth4: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 3c:a8:2a:22:64:df  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
        device interrupt 17

eth5: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 8c:dc:d4:ab:48:a1  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

eth6: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 8c:dc:d4:a8:a0:e8  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

eth7: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 8c:dc:d4:a8:a0:e9  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

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 1  (Local Loopback)
        RX packets 77128853  bytes 11309319030 (10.5 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 77128853  bytes 11309319030 (10.5 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

因为我想从eth2中提取IP（不同的节点也可以在eth2，eth5等中使用IP）。为了概括，我将IP提取为：

/sbin/ifconfig|grep 'inet addr'|grep -v '127.0.0.1'|head -1|awk '{print $2}'|awk -F':' '{print $2}'

不过，我的输出是空字符串。我出了什么问题？

我想提取ip，我们提供了inet和netmask，而且inet不应该是127.0.0.1。

Answer 1

首先，如果您不想解析ifconfig的输出，可以使用

hostname -i

它将提供分配给您的主机名的IP地址。

如果要解析上面的输出并只查找IPv4地址，可以试试这个：

cat test.txt |grep 'inet'|grep -v '127.0.0.1' | awk '{ print $2 }' | grep -oE "\b((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b"

Answer 2

我出错了什么？

您正在寻找 inet addr ...

在inet和netmask上查找不是localhost的ip。

$ ifconfig | grep -oP 'inet \K(?!127\.0\.0\.1)[0-9.]+(?=.*netmask [0-9.]+)'
10.25.26.78

使用PRCE正则表达式\K和lookaheads。

Answer 3

ifconfig | egrep＆＃39; inet | netmask | broadcast＆＃39; | grep -v＆＃39; 127.0.0.1＆＃39; | awk＆＃39; {print $ 2}＆＃39; | awk＆＃39; {print $ 1}＆＃39;

Answer 4

有几种方法可以提取主机的IP地址。

hostname -i | cut -d' ' -f2

gethostip $HOSTNAME | cut -d' ' -f2

如果您仍想查询网络接口，则应使用ip代替ifconfig。

ip -o -f inet addr show scope global | awk -F'[ /]+' '{print $4}'

或者

ip -o -f inet addr show scope global | sed -n 's/.*inet $[^\/]*$\/.*/\1/p'

在您的特定情况下，您只想提取eth2的IP地址。而不是scope global，您将使用dev eth2。

ip -o -f inet addr show dev eth2 | awk -F'[ /]+' '{print $4}'

提取节点IP而不解析ifconfig的输出

4 个答案: