Script to extract interface name and IP from ifconfig

[Karthik S S]

I redirected the iconfig o/p to a file which contains,

lan0: flags=843
inet 19.79.191.17 netmask ffffff00 broadcast 19.79.191.255

lan0:1: flags=843
inet 19.79.191.18 netmask ffffff00 broadcast 19.79.191.255

lan0:2: flags=843
inet 19.79.191.20 netmask ffffff00 broadcast 19.79.191.255

now I need a script to extract only the interface name and the IP. The o/p should be something like this,

lan0 19.79.191.17
lan0:1 19.79.191.18
lan0:2 19.79.191.20

Pl. help.

Thanks,
Karthik S S

[Dani Seely]

Run ifconfig and use the "cut" command to remove the desired sections from the output. I'd give you the syntax but my machine won't boot right now so I can't work at it, but give it a shot.

[Karthik S S]

yeah I tried with cut and awk but having some difficuties due to the non uniform field separators in the ifconfig output. I thought someone at ITRC would have already tried this so posted here (in other words I am too lazy to write the script now :-))

Thanks anyway

-Karthik S S

[Scott Van Kalken]

lanscan | awk '{print $5}' | grep -v Net | grep -v Name | xargs -l ifconfig

[Karthik S S]

Hi Scott,

That doesn't seems to be working for me. I prefer a script that can do the task using the input file as I specified above.

Thanks,
Karthik S S

[Scott Van Kalken · Accepted solution]

#!/bin/sh
LAN=$(lanscan | awk '{print $5}' | grep -v Net | grep -v Name)

for card in $LAN
do
CONFIG=$(ifconfig $card)
echo $CONFIG | awk '{print $1"\t"$4}'
done

~

[Scott Van Kalken]

I should mention that this will fail with a:

ifconfig: no such interface

if you have a physical card that shows up under lanscan but is not configured.

Sorry, I misunderstood your original post.

[V.Tamilvanan]

Hi,
The below script works for me.Give the input file as argument to the script.

typeset -i z
x=`cat $1|awk '/lan/{print $1}'`
y=`cat $1|awk '/inet/{print $2}'`
z=1
for i in $x
do
a=`echo $y|cut -d " " -f$z`
i=${i%?}
echo $i "\t" $a
z=z+1
done