54 comment

1. ipconfig usually doesn’t work outside of windows

2. Opps! Just corrected typo since I work on both UNIX and Windows Server and sometime I get confused :(.

   Thanks, I appreciate your post :)

3. i worked in a company and the I.T man close the face book site what can i do

   1. Work saeed and don`t be a facebook adict

4. Use
   hostname -i
hostname -I
   also find other parameters using man hostname.

5. hostname -i doen’t get the internet ip address:

   ?????:~ # hostname -i
   127.0.0.2

   it gives me the lo ip address.

   I want to get the internet ip address from a command.

   Regards
   Oscar

6. I have found this way to get my ip public address (I have two IPs in my eth0 card for NAT):
   xxxx:~ # ifconfig|sed -n “/inet addr:.*255.255.255.255/{s/.*inet addr://; s/ .*//; p}”

   Regards,
   Oscar

7. I’m trying OpenSuSE LiveCD 64Bits (Linux linux 2.6.25.5-1.1-default #1 SMP 2008-06-07 01:55:22 +0200 x86_64 x86_64 x86_64 GNU/Linux)

   and the previous command doesn’t work. I have different broadcast address, so I get it with the mask (that is the same):

   linux:/home/linux # ifconfig eth0 | sed -n “/inet addr:.*255.255.248.0/{s/.*inet addr://; s/.*//; p}”
   xxx.xxx.xxx.xxx
   linux:/home/linux #

8. Oscar, try this.

   root@azrael:~# ifconfig eth0 | grep inet | awk '{print $2}' | sed 's/addr://'

   Where eth0 is the interface you want to know the ip address. In my case was eth0. This will retrieve the Ip Address from the specified interface. If you have ipv6 active and you only use ipv4 Address, then add a grep . to the end of the sentence.
   it would be like this:
   root@azrael:~# ifconfig eth0 | grep inet | awk '{print $2}' | sed 's/addr://' | grep .

9. I use the above to retrieve the Ip address (dynamic one) from my ISP in order to forward the HTTP petitions to the web server (behind a firewall). Hope it works for you.

10. Is great!

    Thanks a lot, Alejandro

11. almost good:
    ifconfig eth0 | grep 'inet ' | awk '{print $2}' | sed 's/addr://'

    will work ->inet otherwise you will get an empty line from the inet6 line you grepped

12. inet[space]

    1. is there any other option available to get ip address on linux

       1. I simply issue a bash command:root@debian:~ echo $IP

13. that’s why i typed two lines, the first one if you don’t have inet6 active on your server, and the second one if you do have it on.

    root@azrael:~# ifconfig eth0 | grep inet | awk ‘{print $2}’ | sed ’s/addr://’ | grep . <– is not the best way to do it, but the “grep .” stuff works for that matter (at least it does for me) as i said it depends on the flavor of Linux you have and some other stuff.

    Thanks for the tip on the “space after inet” i’ll try it out..

    1. Hi,
       in case someone still interested, i think easiest way to get local ip address is:
       hostname -I (capital i)
       this will return just the ip address with nothing else.

       To get my external ip address (without use dyndns, noip & c) i use in a script:

       wget www.whatismyip.com/automation/n09230945.asp -O /tmp/ip.txt -o /dev/null

       This will write to /tmp/ip.txt my external ip and then i upload the text file with curl
       to a directory on my web page

       #!/bin/bash
       wget www.whatismyip.com/automation/n09230945.asp -O /tmp/ip.txt -o /dev/null
       extip=`cat /tmp/ip.txt`
       echo "$extip" > /tmp/ip.txt
       hostname -I > /tmp/intip.txt
       exit 0
       

       Bye
       Award
       ——————
       C u in /dev/null

14. HOW TO CHANGE IP,SUBNETMASK,GATEWAY,PLS SEND INFORMATION IM TRYING /etc/inet/hosts
    /etc/inet/ipnodes THIS COMMAND BUT IS NOT WORK PLS HELP ME

15. Hi, I’m using RedHat Workstation 4 and would like to write a script to set the IP address, subnet mask and hostname of my machine. The same as Rahul.

    How can i do this?
    Thanks in advance.

16. A lot of the above example scripts/commands dont work corectly due to missformatting of the various Quote characters. Single quotes, double quotes and backticks are messed up.

    ` is a backtick – top left of the keyboard. Its used to go around a command thats ran.
    export FOO=`ls`
    puts the output of the ls command in the variable FOO

    single Quote ‘ and double quotes ” are used in different places to go around arguments to commands. and to keep special chaacters from gettting parsed by the shell.

17. oops.. Watch out for the way this thread/forum alters the matching Quote to the single and double qupte if you cut and paste the examples. ie:

    single Quotes ‘hello’

    double quotes “hello”

    back ticks `hello`

    I had to manually alter the lines after i pasted them to use proper quoteing.

18. how to find the ip address of an website in linux

19. Hi
    we have server configured on Linux.
    Is there any way to get the IP Address of the client which is conncetd to that server.

    1. IP=`who -m --ips | awk '{print $6}'`
       Another syntax
       IP=$(who -m --ips | awk '{print $6}')

20. Kishore , go to Terminal, and say ‘ping yahoo.com’

21. ifconfig eth0 | grep inet | sed -n "s/^\s*inet addr://p" | awk '{ print $1 }'

    Works on my Linux system

22. This one I have used on my Ubunut 9.04 system

    # ifconfig eth0|grep "inet addr:"|awk '{print $2}'|awk -F : '{print $2}'

23. I like to use the simple and concise:
    host $(hostname) | sed 's/.*has address //g'

    It simply returns the IP address that the rest of the world sees for your machine.

24. @wuhaa @Alejandro\ Smith

    Personally I prefer this version:
    $ /sbin/ifconfig eth0 | sed '/inet\ /!d;s/.*r://g;s/\ .*//g'

    Why, you may ask. Because of this:
    
$ time { /sbin/ifconfig eth0|grep "inet addr:"|awk '{print $2}'|awk -F : '{print $2}' ; }
192.168.1.8

    real 0m0.027s
user 0m0.013s
sys 0m0.003s

    $ time { /sbin/ifconfig eth0 | grep inet | awk '{print $2}' | sed 's/addr://' | grep . ; }
192.168.1.8

    real 0m0.009s
user 0m0.011s
sys 0m0.010s

    $ time { /sbin/ifconfig eth0 | sed '/inet\ /!d;s/.*r://g;s/\ .*//g' ; }
192.168.1.8

    real 0m0.005s
user 0m0.005s
sys 0m0.004s

    The fewer processes, the faster the execution.

    1. brill score! well done.

    2. Excellent info on that.. thanks for updating this. That’s true, fewer processes translates into a faster execution.

       Two years ago when i first posted on this faq with a “solution”, i was a new linux user, and i did not had any experience on this. I read some good information on bash scripting and came out with this solution for a problem i was having at that time.

       I didn’t care back then if it was faster than other solutions, i just needed to solve the issue.. ;-) but of course, YOU are completely right with your point of view.

       Thank you all for sharing your knowledge on this.

       God bless you all.

    3. Similar approach, but with Awk instead of sed:

       time { ifconfig vmnet8 | awk ‘/inet addr:/ {print substr($2,6)}’ ; }

       Do some *nix implementations put a space after ‘addr:’ ? If so, this will break in those cases.

25. Hi Award

    Excellent command to find the originating IP addresss
    hostname -i

    Thanks!!

    1. On my Ubuntu box, “hostname -i” does not give the same result as “host $(hostname)”.

26. Simples…
    Work For me (Debian Lenny 5.0)
    # ifconfig eth0 | grep inet | grep -v "inet6" | awk {'print $3'}

27. # paste this in your ~/.bashrc myip (){ clear echo echo " ip local: `hostname -I`" echo " router: `route -n | awk '/UG/ {print $2}'`" echo " external ip: `curl --connect-timeout 4 -s sputnick-area.net/ip`" echo read -sn 1 -p " Press any key to continue..." clear }

    # paste this in your ~/.bashrc myip (){ clear echo echo " ip local: `hostname -I`" echo " router: `route -n | awk '/UG/ {print $2}'`" echo " external ip: `curl --connect-timeout 4 -s sputnick-area.net/ip`" echo read -sn 1 -p " Press any key to continue..." clear }

    Run it as
    source ~/.bashrc
myip

28. Now this works for Solaris 10
    ifconfig -a

29. To find the ip address of Unix box from Unix prompt:

    nslookup

30. Here’s one that works (quickly) for me using cut:

    time { ifconfig eth0|grep 192|cut -d: -f2|cut -d' ' -f1 ; }
    Look for summarize system resource usage

    192.168.111.75
    
    real	0m0.007s
    user	0m0.000s
    sys	0m0.002s
    

31. A computer may have multiple network interfaces and therefore more than one ip-address you should try:

    /sbin/ifconfig [dev] | \
sed -n '/inet [Aa]d\{1,2\}resse\{0,1\}:/ { s# *inet [Aa]d\{1,2\}resse\{0,1\}:##; s# .*##p }'

    If you omit [dev] this command will give you a list of all IP-address and should work with English and German localization.

    hostname -i is unpredictable in its result and nslookup $(hostname) will give you only what DNS knows about your machine.

32. its realy grtt i found my way thankss..

33. i have always the same result : inet iddr : 127.0.0.1

    what could be the problem ) thank you

34. Just running the following

    # ip -f inet -o addr show eth0

    The result will be (on one line)

    2: eth0   inet 192.168.2.100/24 brd 192.168.2.255 scope global eth0

    Then you can apply a simple filter on it to extract the IP

35. Sorry for the typos. Unable to re-edit my post.

36. ip -4 -o addr show dev eth0 |awk '{split($4,a,"/") ;print a[1]}'

37. I’m using cygwin on windows and a VPN. None of the above worked for me. I had to use the following command and some grep and sed commands

    route print | egrep " 255.255.255.255.*123.123.123.123" | sed 's/\s*\(.*\)255.255.255.255.*/\1/g'
    ### I’ve used 123.123.123.123 as a fictional router address.##

    Explanation:
    The vertical line, the pipe symbol, | , takes the output of everything on the left and feeds it to the command on the right. So the solution that works for me (the rest do not) involves essentially three commands – each of which that does something and parse things to the next step.

    • route print : the main command of many things – over many lines
    • egrep " 255.255.255.255.*123.123.123.123 : this selects a line that has the netmask at 255.255.255.255 then any characters as shown by the .* after the 255’s and then looks for my router’s address of 123.123.123.123.
    • sed 's/\s*\(.*\)255.255.255.255.*/\1/g' : sed command replaces/extracts text. basic use: ‘s/replace/withThis/g’ does a global search and replaces all references of replace with the string withThis. This sed command extracts the part of the line before the 255 part. It ignores leading spaces indicated by the \s and also anything after the 255 part shown by .* which is a shorthand for any character or number (the . part) that is found zero of more times (the * part). By placing part of the replace string in parentheses \(.*\) I am saying keep this part. So it’s the part after leading spaces and before the 255s. The \1 part is the replacement part of the sed command throws away all the other stuff and just keeps that part in parentheses and is displayed. This is the IP address on my machine.

38. Excelent post
    i’m learning i’m learning !!!
    :3

39. how about this: curl http://icanhazip.com

40. Fantastic, as usual.

41. I want to show ip address using the command line.

42. How to find IP Address in Linux Operating System
    i’m using this command
    ifconfig ,/sbin/ifconfig and /sbin/ifconfig eth0 and
    ifconfig eth0 | grep inet | sed -n “s/^\s*inet addr://p” | awk ‘{ print $1 }’ and
    more command i’m using but i’m not geting a ip address pls help any one

43. As a sample: I’m using IPSec/StrongSWAN and ifconfig doesn’t show the ip’s used by strongswan, ip does.

44. hey
    Any idea about the how to other ip address to find the server and cpu usage & pid find.

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