Question

How can i get only IP and which interface IP it is? So that i can keep a record file such as realtime.ini

1 – test.sh

#!/bin/bash
ipstring ='inet (.*)'

for i in $(ip addr);
do
        echo $i #on found it write down to my realtime.ini as a list for future query
done

2 – realtime.ini

em1,192.168.1.2
lo,127.0.0.1
wlan0,<not found>

Follow up: Just for single ip:
$ ifconfig eth0 | grep ‘inet addr:’ | cut -d: -f2 | awk ‘{ print $1}’
192.168.1.2

Answer 1

This is not terribly elegant, nor is bash, but you can do the following if you have both awk and sed:

ifconfig | awk 'BEGIN { FS = "\n"; RS = "" } { print $1 $2 }' | sed -e 's/ .*inet addr:/,/' -e 's/ .*//'

I wouldn’t bet on this being hugely portable either, so maybe someone has a better answer.