HEELPBOOK - How to Find out the IP address assigned to eth0 and display IP only (Linux) ###################

##### Question

I need to get the IP address assigned to eth0 Linux interface. How do I find out IP address only? I don't want other information displayed by Linux ifconfig command.


##### Answer

For shell script or may be for other cause you may need the IP address only. You can use ifconfig command with grep and other filters.

Default output of /sbin/ifconfig command is all interfaces:


$ /sbin/ifconfig


Output:

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:69527 errors:0 dropped:0 overruns:0 frame:0
TX packets:69527 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:41559546 (39.6 MiB) TX bytes:41559546 (39.6 MiB)


eth0 Link encap:Ethernet HWaddr 00:17:9A:0A:F6:44
inet addr:192.168.2.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::217:9aff:fe0a:f644/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:227614 errors:0 dropped:0 overruns:0 frame:0
TX packets:60421 errors:0 dropped:0 overruns:0 carrier:0
collisions:272 txqueuelen:1000
RX bytes:69661583 (66.4 MiB) TX bytes:10361043 (9.8 MiB)
Interrupt:17


ra0 Link encap:Ethernet HWaddr 00:50:56:C0:00:01
inet addr:192.168.1.2 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::250:56ff:fec0:1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1024 errors:0 dropped:0 overruns:0 frame:0
TX packets:1320 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)


Now you just select eth0 as follows:


$ /sbin/ifconfig eth0


Now you just wanted the IP address, use grep to get the IP:


$ /sbin/ifconfig eth0| grep 'inet addr:'


Output:


inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0


To get IP address from use cut command:


$ /sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2


Output:


192.168.2.1 Bcast


Finally remove Bcast with awk:


$ /sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'


Output:


192.168.2.1


############ ARTICLE INFO #############

Article Month: January
Article Date: 01/01/2013
Permalink: http://heelpbook.altervista.org/2013/how-to-find-out-the-ip-address-assigned-to-eth0-and-display-ip-only-linux/
Source: http://www.cyberciti.biz/faq/how-to-find-out-the-ip-address-assigned-to-eth0-and-display-ip-only/
Language: English

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