How can I display the IP address of an interface?

Question

If I want to display the IP address that is assigned to eth1, how can I do this in Bash?

pstanton · Answer 1 · 2018-05-10T12:31:50.517

22

As @Manuel mentioned, ifconfig is out of date, and ip is the recommended approach going forward.

ip -f inet addr show eth1

and to use @bleater's sed or @Jason H.'s awk to filter the output (depending on if you want the mask)

ip -f inet addr show eth1 | sed -En -e 's/.*inet ([0-9.]+).*/\1/p'

ip -f inet addr show eth1 | awk '/inet / {print $2}'

edited May 10 '18 at 12:31

answered May 10 '18 at 12:00

pstanton

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This answer is also fit if you need only IPv4-addresses. – red0ct Nov 11 '20 at 14:54
`ip -f inet6 addr show eth1 | sed -En -e 's/.*inet6 ([0-9a-fA-F:]+).*/\1/p'` for ipv6 – Adriel Santos Jun 30 '22 at 14:39
`ip -f inet addr show lo | awk '/inet / {print $2}'` gives me `127.0.0.1/8`, not the desired `127.0.0.1`. – Abdull Oct 31 '22 at 10:40
```ip -4 -o addr show eth0 | awk '{print $4}' | cut -d "/" -f 1``` if you don't like sed – MoonRaiser Feb 13 '23 at 12:02

user9517 · Accepted Answer · 2011-08-16T21:41:44.860

17

Try this (Linux)

/sbin/ifconfig eth1 | grep 'inet addr:' | cut -d: -f2| cut -d' ' -f1

or this (Linux)

/sbin/ifconfig eth0 | awk -F ' *|:' '/inet addr/{print $4}'

or this (*BSD)

ifconfig bge0 | grep 'inet' | cut -d' ' -f2

or this (Solaris 10)

ifconfig e1000g0 | awk '/inet / {print $6}'

Obviously change the interface name to match the one you want to get the information from.

edited Aug 16 '11 at 21:41

answered Oct 27 '10 at 11:03

user9517

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worked also ifconfig eth1| awk -F ' *|:' '/inet addr/{print $4}' – user47556 Oct 27 '10 at 11:37
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On *BSD systems the ifconfig output is a bit different - `ifconfig bge0 | grep 'inet' | cut -d' ' -f2` will work (substitute your appropriate interface name in place of `bge0`, obviously) – voretaq7 Aug 15 '11 at 18:08
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ip addr show eth1| grep inet|awk '{print $2;}' – navaho Aug 16 '11 at 22:18

Jason H. · Answer 3 · 2018-07-06T21:24:36.673

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On a Linux system:

hostname --all-ip-addresses

will give you only the IP address.

On a Solaris system use:

ifconfig e1000g0 | awk '/inet / {print $2}'

edited Jul 06 '18 at 21:24

answered Apr 07 '15 at 18:48

Jason H.

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From the hostname(1) man page: `Avoid using this option; use hostname --all-ip-addresses instead.` – bleater Nov 14 '17 at 01:06
amazing tips loving it thank you very much – Kiwy Jun 21 '21 at 10:37

score 9 · Answer 4 · answered Nov 11 '20 at 15:20

9

To obtain both IPv4 and IPv6 IP addresses with netmasks just try:

ip a l eth1 | awk '/inet/ {print $2}'

Or without netmasks (can't imagine why you need an IP address without a mask):

ip a l eth1 | awk '/inet/ {print $2}' | cut -d/ -f1

answered Nov 11 '20 at 15:20

red0ct

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"can't imagine why you need an IP address without a mask" Simple, there's very few clients that support it. You can't ping 1.1.1.1/32. https://1.1.1.1/32 would return a 404. You can't point an A record to it, nor insert it into a reverse proxy config, nor tunnel to it, nor put it into /etc/hosts. – copycat Mar 03 '21 at 01:46
@copycat What is the need to ping your own interface? – red0ct Jan 18 '22 at 13:14
"l" stands for list (not documented in inline help (iproute2 version 5.5.0), only documented in manpage). – 3r1d Jul 27 '23 at 03:33

score 9 · Answer 5 · answered Dec 05 '12 at 08:46

9

A better way: get ip adress from command "ip", because "ifconfig" is out of date. Otherwise you will get a problem on using "ifconfig", because the output of ifconfig is language dependend.

I use this command to get all IPs (IPv4):

ip addr show | grep -o "inet [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*" | grep -o "[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*"

answered Dec 05 '12 at 08:46

Manuel

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`ifconfig` has the advantage of existing on systems that aren't Linux... – voretaq7 Dec 07 '12 at 03:59
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NB: This is only about IPv4-addresses. – red0ct Nov 11 '20 at 14:51

score 2 · Answer 6 · answered Nov 17 '22 at 01:35

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Works well on various linux:

ip -brief address show eth0 | awk '{print $3}' | awk -F/ '{print $1}'

answered Nov 17 '22 at 01:35

tbo47

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score 2 · Answer 7 · answered Oct 27 '10 at 10:58

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maybe this will help

ifconfig eth1

answered Oct 27 '10 at 10:58

Marco Schmid

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score 1 · Answer 8 · answered Jan 15 '23 at 07:26

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on Ubuntu 20.04

$ sudo apt install moreutils
$ ifdata -pa eth0
192.168.1.152

answered Jan 15 '23 at 07:26

3r1d

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score 0 · Answer 9 · answered Sep 06 '22 at 01:18

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This is what I use:

ip r s | awk '/eth0/ {print $7}'

will print, for example: 192.168.0.1

answered Sep 06 '22 at 01:18

lepe

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score 0 · Answer 10 · answered Sep 09 '22 at 14:00

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On MacOS I use ipconfig getifaddr <interface-name>
The command is listed under the BSD System Manager's Manual.

answered Sep 09 '22 at 14:00

Tech Wz

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score 0 · Answer 11 · answered Nov 14 '17 at 01:07

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One liner with sed:

ifconfig wlan0 | sed -En -e 's/.*inet ([0-9.]+).*/\1/p'

Replace wlan0 with the desired interface.

answered Nov 14 '17 at 01:07

bleater

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score 0 · Answer 12 · edited May 10 '18 at 17:45

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I tried the accepted answer on CentOS 7, but it does not work.

/sbin/ifconfig eth0 | grep 'inet ' | tr -s ' ' | cut -d" " -f3

worked for me, in case someone else is also running into the same problem.

edited May 10 '18 at 17:45

Michael Hampton

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answered May 10 '18 at 17:20

Grid_LTS

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As mentioned by @Manuel and @pstanton, `ifconfig` should be avoided. It's actually removed in some newer distros. This is probably why your answer was downvoted. – Server Fault May 10 '18 at 19:30

How can I display the IP address of an interface?

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