059-取值IP

1.想取值機器的IP的值，技巧：一些字符用.*代替

[root@cnsz142728 ~]# ifconfig eth0                                    
eth0      Link encap:Ethernet  HWaddr 00:50:56:9E:2F:38  
          inet addr:10.25.172.92  Bcast:10.25.173.255  Mask:255.255.254.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:334395 errors:0 dropped:0 overruns:0 frame:0
          TX packets:156160 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:27189144 (25.9 MiB)  TX bytes:9208757 (8.7 MiB)

[root@cnsz142728 ~]# ifconfig eth0 |sed -n '2p'
          inet addr:10.25.172.92  Bcast:10.25.173.255  Mask:255.255.254.0
[root@cnsz142728 ~]# ifconfig eth0 |sed -n '2p' |sed 's#^.*dr##g'
:10.25.172.92  Bcast:10.25.173.255  Mask:255.255.254.0
[root@cnsz142728 ~]# ifconfig eth0 |sed -n '2p' |sed 's#^.*dr##g'|sed 's#  B.*##g'
:10.25.172.92

2.方法二

[root@cnsz142728 ~]# ifconfig eth0 |sed -n '2s#^.*dr##gp'
:10.25.172.92  Bcast:10.25.173.255  Mask:255.255.254.0
[root@cnsz142728 ~]# ifconfig eth0 |sed -n '2s#^.*dr##gp'|sed 's#  B.*##g'
:10.25.172.92