/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.

Have a look here (German page).

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

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.

nslookup

Excellent command to find the originating IP addresss
hostname -i

Thanks!!

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

wget http://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 http://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

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.

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.

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

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

works on my system

single Quotes ‘hello’

double quotes “hello”

back ticks `hello`

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