linux系统下获取所有处于UP状态的接口的shell

来源：互联网发布：监控小孩上网的软件编辑：程序博客网时间：2024/05/18 01:28

linux系统下获取所有处于Down状态的接口的shell

ip link | grep "state DOWN"
3: em2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
4: em3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
5: em4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
136: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 500
142: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN
143: ovsbr0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN

ip link | grep "state UP"
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000

使用awk匹配到第二个字段，然后sed替换掉冒号。

ip link | grep "state DOWN" | awk '{ print $2 }' | sed 's/://g'

em2
em3
em4
virbr0-nic
ovs-system
ovsbr0

另一种有缺陷的方式：

ip route show
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
10.12.28.0/22 dev br0 proto kernel scope link src 10.12.28.59
169.254.0.0/16 dev br0 scope link metric 1006
default via 10.12.28.1 dev br0

ip route show | awk '{ print $3}'
virbr0
br0
br0
10.12.28.1

注意最后一显示的默认路由：default via 10.12.28.1 dev br0

这种方式需要匹配到 dev这个字段后的第一个字段，而且没有显示接口状态是否是up的功能。

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