linux 下取ip

[root@15b883 ~]# ifconfig eth0 |sed -nr '/inet addr/s#[^0-9]*([0-9.]*).*#\1#gp'

192.168.31.128

[root@15b883 ~]# ifconfig eth0 |sed -n '2p'|sed 's#^.*dr:##g'|sed's#  B.*$##g'

192.168.31.128

[root@15b883 ~]# ifconfig eth0 |sed -n '2s#^.*dr:##gp' |sed 's#  B.*$##g'

192.168.31.128

[root@15b883 ~]# ifconfig eth0 |sed -nr 's#^.*dr:(.*)  B.*$#\1#gp'

192.168.31.128

[root@15b883 ~]# ifconfig eth0 |awk -F "[ :]+" 'NR==2{print $4}'

192.168.31.128

[root@15b883 ~]# ifconfig eth0 |grep -o "inetaddr:[0-9.]*"|grep -o "[0-9.]*"

192.168.31.128

[root@15b883 ~]# ifconfig eth0|sed -n '2p' |sed -r's#(^.*dr:)(.*)(  Bc.*$)#\2#g'

192.168.31.128

[root@15b883 ~]# ifconfig eth0 |grep -Po '(?<=addr:)\S+'

192.168.31.128

[root@15b883]# hostname -i

211.98.71.195

[root@15b883]# hostname -I

10.0.0.100 172.16.1.100

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