Which terminal command to get just IP address and nothing else

Question

I m trying to use just the IP address  inet  as a parameter in a script I wrote   Is there an easy way in a unix terminal to get just the IP address  rather than looking through ifconfig

User · Answer

I would Use Hostname -L to get just the IP to use as a variable in a script

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These two ways worked for me   To get IP address of your interface eth0  Replace eth0 in the below example with your interface name      ifconfig eth0   grep -w  inet    tr -s       cut -f3 -d     Using hostname  This will give you the inet i e  IPAddress of your etho  using -I will give you inet value of all the interfaces whereever this value is present    hostname -i

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Here is my version  in which you can pass a list of interfaces  ordered by priority   getIpFromInterface         interface  1     ifconfig   interface    gt   dev null 2 gt  amp 1  amp  amp  ifconfig   interface    awk -F inet      print  2      awk    print  1      grep      getCurrentIpAddress        IFLIST      -  IFLIST           for currentInterface in   IFLIST         do         IP   getIpFromInterface   currentInterface             -z   IP      amp  amp  continue     echo   IP         return     done    IFLIST  tap0 en1 en0  getCurrentIpAddress      So if I m connected with VPN  Wifi and ethernet  my VPN address  on interface tap0  will be returned  The script works on both linux and osx  and can take arguments if you want to override IFLIST   Note that if you want to use IPV6  you ll have to replace  inet   by  inet6

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To get only the IP address on Mac OS X you can type the following command   ipconfig getifaddr en0

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Generally  it is never guaranteed that a system will only have one IP address  for example  you can have both an ethernet and wlan connections  and if you have an active VPN connection then you ll have yet another IP address  Linux On Linux  hostname -I will list the current IP address es   Relying on it always returning just one IP address will most likely not work as expected under some scenarios  i e  a VPN link is up  multiple ethernet adapters  etc   so a more reliable way would be converting the result to an array and then loop over the elements  ips    hostname -I    for ip in  quot   ips     quot  do     echo  ip done   Note  If hostname -I returns the IP both in IPv4 and IPv6 formats then you can use instead hostname -I   cut -f1 -d    to only show the IPv4 IP   OSX On OSX  if you know the interface  you could use     ipconfig getifaddr en0 192 168 1 123  which will return just the IP address  Or you could loop over possible interface names  starting with a suffix  i e  en  for NUMBER in   seq 0 5   do     ip  ipconfig getifaddr en NUMBER      if   -n  quot  ip quot     then         myip  quot  ip quot          break     fi done  echo  myip  Also  getting the IP address becomes non-deterministic in case both a cable and wifi connections are established  when a machine has more than one ethernet interfaces  or when VPN tunnels are up  Getting the external IP If you need the external IP  then you can query a text-mode service  for example curl https   ipecho net plain would return a plain text external IP  A faster alternative is to query a known DNS server  e g   dig  ns1-1 akamaitech net ANY whoami akamai net  short

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On Redhat 64bit  this solved problem for me   ifconfig  1 sed -n 2p awk    print  2    awk -F      print  2

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I don t see any answer with nmcli yet which is a command-line tool for controlling NetworkManager  So here you go    wolf linux    nmcli device  DEVICE  TYPE      STATE        CONNECTION  eth1    ethernet  unavailable  --          eth0    ethernet  unmanaged    --          lo      loopback  unmanaged    --          wolf linux      If you want to get the information from specific network interface  let say lo for this example  wolf linux    nmcli device show lo GENERAL DEVICE                          lo GENERAL TYPE                            loopback GENERAL HWADDR                          00 00 00 00 00 00 GENERAL MTU                             65536 GENERAL STATE                           10  unmanaged  GENERAL CONNECTION                      -- GENERAL CON-PATH                        -- IP4 ADDRESS 1                           127 0 0 1 8 IP4 GATEWAY                             -- IP4 ROUTE 1                             dst   127 0 0 0 8  nh   0 0 0 0  gt  IP4 ROUTE 2                             dst   127 0 0 1 32  nh   0 0 0 0 gt  IP6 ADDRESS 1                             1 128 IP6 GATEWAY                             -- IP6 ROUTE 1                             dst     1 128  nh       mt   256 IP6 ROUTE 2                             dst     1 128  nh       mt   0   gt  wolf linux      But since you just want to get the IP address  just send the output to grep  cut or awk  Let s do it step by step   Not sure what s wrong  the code sample format just didn t work for these 3 example    Get the IPv4 line wolf linux    nmcli device show lo   grep 4 A IP4 ADDRESS 1                           127 0 0 1 8 wolf linux     Use awk to get the IP wolf linux    nmcli device show lo   awk   4 A   print  2   127 0 0 1 8 wolf linux     Use cut to remove the CIDR notation   8  wolf linux    nmcli device show lo   awk   4 A   print  2     cut -d   -f1 127 0 0 1 wolf linux      There your answer  Please take note that there are tons of ways to do it using the tools that I demonstrated just now  Let s recap the commands that I used  nmcli device show lo   grep 4 A nmcli device show lo   awk   4 A   print  2   nmcli device show lo   awk   4 A   print  2     cut -d   -f1  Sample output for these 3 commands Command 1 output IP4 ADDRESS 1                           127 0 0 1 8  Command 2 output 127 0 0 1 8  Command 3 output 127 0 0 1

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That would do the trick in a Mac    ping   ifconfig en0   awk   1     inet   print  2      That resolved to ping 192 168 1 2 in my machine   Pro tip         means run whatever is inside the parentheses in a subshell and return that as the value

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We can simply use only 2 commands   ifconfig   awk   to get just the IP  v4  we want like so   On Linux  assuming to get IP address from eth0 interface  run the following command    sbin ifconfig eth0   awk   inet addr  print substr  2 6      On OSX  assumming to get IP adddress from en0 interface  run the following command    sbin ifconfig en0   awk   inet   print  2     To know our public external IP  add this function in    bashrc  whatismyip          curl -s  http   api duckduckgo com  q ip amp format json    jq   Answer    grep --color auto -oE   b  0-9  1 3     3  0-9  1 3  b      Then run  whatismyip

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use this one line script   ifconfig   grep  inet     grep -v 127 0 0 1 awk  match  0     0-9     0-9     0-9     0-9       print substr  0 RSTART RLENGTH     mac  amp  linux  tested in ubuntu  both works

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Use the following command    sbin ifconfig   netstat -nr   tail -1   awk   print  NF      awk -F    inet   print  2     cut -f1 -d

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In man hostname there is even more easier way which automatically excluding loopback IP and showing only space separated list of all assigned to host ip addresses   root srv    hostname --all-ip-addresses 11 12 13 14 192 168 15 19   root srv    ip a 1  lo   lt LOOPBACK UP LOWER UP gt  mtu 16436 qdisc noqueue state UNKNOWN    link loopback 00 00 00 00 00 00 brd 00 00 00 00 00 00    inet 127 0 0 1 8 scope host lo    inet6   1 128 scope host     valid lft forever preferred lft forever 2  venet0   lt BROADCAST POINTOPOINT NOARP UP LOWER UP gt  mtu 1500 qdisc noqueue state UNKNOWN    link void    inet 11 12 13 14 32 scope global venet0 0   inet 192 168 15 19 32 scope global venet0 1

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bin sh   Tested on Ubuntu 18 04 and Alpine Linux    List IPS of following network interfaces    virtual host interfaces   PCI interfaces   USB interfaces   ACPI interfaces   ETH interfaces for NETWORK INTERFACE in   ls  sys class net -al   grep -iE    eth 0-9    vif pci acpi usb     sed -E  s            - gt     1     do      IPV4 ADDRESSES   ifconfig  NETWORK INTERFACE   grep -iE   inet addr      inet          sed -E  s  s  inet addr      inet                  2        IPV6 ADDRESSES   ifconfig  NETWORK INTERFACE   grep -iE   inet6 addr      inet6          sed -E  s  s  inet6 addr      inet6                  2        if   -n   IPV4 ADDRESSES         -n   IPV6 ADDRESSES     then         echo  NETWORK INTERFACE  NETWORK INTERFACE          for IPV4 ADDRESS in  IPV4 ADDRESSES  do              echo  IPV4  IPV4 ADDRESS          done         for IPV6 ADDRESS in  IPV6 ADDRESSES  do              echo  IPV6  IPV6 ADDRESS          done     fi done

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hostname -I     This command will give you the exact ip address as you want in Ubuntu

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I wanted something simple that worked as a Bash alias  I found that hostname -I works best for me  hostname v3 15   hostname -i returns the loopback IP  for some reason  but hostname -I gives me the correct IP for wlan0  and without having to pipe output through grep or awk  A drawback is that hostname -I will output all IPs  if you have more than one

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If you have limited environment  you may use this command   ip -4 addr show dev eth0   grep inet   tr -s       cut -d    -f3   head -n 1

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Few answers appear to be using the newer ip command  replacement for ifconfig  so here is one that uses ip addr  grep  and awk to simply print the IPv4 address associated with the wlan0 interface   ip addr show wlan0 grep inet grep -v inet6 awk   print  2   awk   split  0 a       print a 1      While not the most compact or fancy solution  it is  arguably  easy to understand  see explanation below  and modify for other purposes  such as getting the last 3 octets of the MAC address like this   ip addr show wlan0 grep link ether awk   print  2   awk   split  0 mac       print mac 4  mac 5  mac 6      Explanation  ip addr show wlan0 outputs information associated with the network interface named wlan0  which should be similar to this   4  wlan0   lt BROADCAST MULTICAST UP LOWER UP gt  mtu 1500 qdisc pfifo fast state UP group default qlen 1000     link ether dc a6 32 04 06 ab brd ff ff ff ff ff ff     inet 172 18 18 1 24 brd 172 18 18 255 scope global noprefixroute wlan0        valid lft forever preferred lft forever     inet6 fe80  d340 5e4b 78e0 90f 64 scope link         valid lft forever preferred lft forever   Next grep inet filters out the lines that don t contain  inet   IPv4 and IPv6 configuration  and grep -v inet6 filters out the remaining lines that do contain  inet6   which should result in a single line like this one       inet 172 18 18 1 24 brd 172 18 18 255 scope global noprefixroute wlan0   Finally  the first awk extract the  172 18 18 1 24  field and the second removes the network mask shorthand  leaving just the IPv4 address   Also  I think it s worth mentioning that if you are scripting then there are often many richer and or more robust tools for obtaining this information  which you might want to use instead  For example  if using Node js there is ipaddr-linux  if using Ruby there is linux-ip-parser  etc   See also https   unix stackexchange com questions 119269 how-to-get-ip-address-using-shell-script

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Command ifconfig is deprected and you should use ip command on Linux   Also ip a will give you scope on the same line as IP so it s easier to use   This command will show you your global  external  IP   ip a   grep  scope global    grep -Po     lt  inet    d       All IPv4  also 127 0 0 1    ip a   grep  scope    grep -Po     lt  inet    d       All IPv6  also   1    ip a   grep  scope    grep -Po     lt  inet6    da-z

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When looking up your external IP address on a NATed host  quite a few answers suggest using HTTP based methods like ifconfig me eg     curl ifconfig me ip   Over the years I have seen many of these sites come and go  I find this DNS based method more robust     dig  short myip opendns com  resolver1 opendns com   I have this handy alias in my    bashrc   alias wip  dig  short myip opendns com  resolver1 opendns com

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To print only the IP address of eth0  without other text  ifconfig eth0   grep -Po     lt  inet addr    d      To determine your primary interface  because it might not be  quot eth0 quot    use  route   grep  default   sed  quot s       quot   The above two lines can be combined into a single command like this  ifconfig  route   grep  default   sed  quot s       quot         grep -Po     lt  inet addr    d

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I always wind up needing this at the most unexpected times and  without fail  wind up searching for threads like this on SO  So I wrote a simple script to get IPv4 addresses via netstat  called echoip - you can find it here  The bash for network addresses looks like this  it also gets your public address from ipecho net   IPV4   d     d   3   INTERFACES  netstat -i   grep -E   IPV4    cut -d     -f 1  INTERFACE IPS  netstat -i   grep -oE   IPV4    for i in     INTERFACES       do   printf   s  t s n     INTERFACES  i       INTERFACE IPS  i    done   The echoip script yields an output like this     echoip public  26 106 59 169 en0     10 1 10 2

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On latest Ubuntu versions  14 04 - 16 04   this command did the trick for me   hostname -I   awk   print  1

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If you don t want to use ifconfig nor regex    ip addr   grep eth0   grep inet   awk   print  2     cut -d quot   quot  -f1

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You can write a script that only return the IP like    sbin ifconfig eth0   grep  inet addr    cut -d  -f2   awk   print  1     For MAC   ifconfig   grep  inet     grep -v 127 0 0 1   cut -d   -f2   Or for linux system  hostname -i   awk   print  3     Ubuntu   hostname -i   Debian

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The IPv4 address for the default route  ip address show   ip route   grep  quot  default  quot    head -n1   grep -Po  quot    lt  dev        quot     grep -Po  quot    lt  inet         quot   The IPv6 address for the default route  ip address show   ip route   grep  quot  default  quot    head -n1   grep -Po  quot    lt  dev        quot     grep -Po  quot    lt  inet6         quot   These only require commands ip and grep with support for -P and -o  The head -1 is required because ip route may show multiple default routes when system has complex enough network setup  If you don t mind which IP is which  you can just do ip route   grep -Po     lt  src          or hostname --all-ip-addresses

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This will give you all IPv4 interfaces  including the loopback 127 0 0 1   ip -4 addr   grep -oP     lt  inet s  d     d   3     This will only show eth0   ip -4 addr show eth0   grep -oP     lt  inet s  d     d   3     And this way you can get IPv6 addresses   ip -6 addr   grep -oP     lt  inet6 s   da-f       Only eth0 IPv6   ip -6 addr show eth0   grep -oP     lt  inet6 s   da-f

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curl ifconfig co    This returns only the ip address of your system

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ip addr awk   eth0   amp  amp   inet   gsub     0-9  0-9        print  2     shows all your ips

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I prefer not to use awk and such in scripts   ip has the option to output in JSON   If you leave out  interface then you get all of the ip addresses   ip -json addr show  interface       jq -r         addr info     select  family     inet      local

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You can also use the following command    ip route   grep src   NOTE  This will only work if you have connectivity to the internet

[shell] Which terminal command to get just IP address and nothing else?

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