Shell Command for Getting IP Address?

Question

Is there a bash command to find the IP address for an Ubuntu box? I need to find the IP address so I can ssh into the machine later.

Answer 1

/sbin/ifconfig -a

Answer 2

You can use:

/bin/ip addr

Answer 3

If you have an internal address in use, checking

curl http://myip.dnsomatic.com

might be a good idea on unix shells.
Or, just plonk that URL into your browser.

---

If you get a different answer from the "ifconfig -a" result,
the ifconfig gave your internal address -- which will probably not work from outside.

---

Even if all seems fine, you could have a firewall in place that will disallow incoming ssh connections.
At which time you should try the port of interest from a browser on the machine at,

http://www.canyouseeme.org/

That will confirm connectivity through,

• external IP address (showing it to you on that page)
• NAT, Port Forwards
• Firewalls

Answer 4

/sbin/ifconfig|grep inet|head -1|sed 's/\:/ /'|awk '{print $3}'

If you need your internal adress append your interface after ifconfig, e.g.

 /sbin/ifconfig eth0|grep inet|head -1|sed 's/\:/ /'|awk '{print $3}'

Answer 5

If you are behind a NAT, and need the public IP, use this:

wget -q -O - checkip.dyndns.org|sed -e 's/.Current IP Address: //' -e 's/<.$//'

taken from: http://www.go2linux.org/what-is-my-public-ip-address-with-linux

Answer 6

 curl icanhazip.com

tee hee!

From http://www.commandlinefu.com/commands/view/2966/return-external-ip

Answer 7

/bin/hostname -i

Answer 8

If you need to find out what the IP address of your router, you could run this command.

dig +short myip.opendns.com @208.67.222.222 @208.67.220.220

If you are using OpenDNS for your dns server, you could shorten it to:

dig +short myip.opendns.com

You could also use this command.

curl http://myip.dnsomatic.com

Answer 9

The simplest way to go about it is probably

ifconfig eth0

assuming the machine has a single IP address on the default wired interface - you might need

ifconfig wlan0

if it's on WiFi.

Answer 10

ip address show scope link

It will show you the IP address of living - has link - interfaces. But it is not a bash command. Bash has no ability to know about IP and network at all.

Answer 11

What I understand is you want to connect a remote ubuntu machine which has dynamic ip. Go dyndns.org site and open a free account. Then on the remote machine you need to install a dynamic ip tool.

sudo aptitude install dyndns-client

so you can ssh remote machine via

ssh username@yourdynamicnamealias.dyndns.org

So after configuration you will never need the remote machine ip address.

Answer 12

If you have multiple interfaces, could be useful to specify which one you want IP. if you want IPV4 address of interface 'eth0':

ip addr show dev eth0 | grep "inet " | awk '{ print $2 }' 

if you want IPV6 address of interface 'eth0':

ip addr show dev eth0 | grep "inet6 " | awk '{ print $2 }' 

if you want to search for an IP between two common interfaces of a laptop, wlan0 and eth0:

CURRENT_IP=''
for INTERFACE in wlan0 eth0; do
    if [ -z $CURRENT_IP ]; then
        CURRENT_IP=$(ip addr show dev $INTERFACE | grep "inet " | awk '{ print $2 }')
    fi
done

Answer 13

I once golfed the extraction of IP address on Linux:

http://www.catonmat.net/blog/golfing-the-extraction-of-ip-addresses-from-ifconfig/