command to retrieve IP address?

km4hr · 01-17-2005, 08:09 AM

I'm working on a bash script. I need a statement that gets the local computer's IP address. I see that 'ifconfig eth0' returns a bunch of stuff that contains the IP address but I then have to use grep/awk/sed or whatever to filter out just the address. Is there an easier way?
xyz

Frustin · 01-17-2005, 08:36 AM

/sbin/ifconfig eth0 | grep "inet add" | cut -f2 -d\: | cut -f1 -d" "

there is probably an easier way (there always is).

homey · 01-17-2005, 08:40 AM

If you're going to bash scripts, learn to love grep/awk/sed.

ip addr | grep "init "

scowles · 01-17-2005, 08:43 AM

Quote:

Originally posted by km4hr
I'm working on a bash script. I need a statement that gets the local computer's IP address. I see that 'ifconfig eth0' returns a bunch of stuff that contains the IP address but I then have to use grep/awk/sed or whatever to filter out just the address. Is there an easier way?
xyz

Not that I'm aware of. If there was a command that returned "just" the IP address, it is probably a shell script that called ifconfig | grep | sed etc...

FWIW: If you are new to shell scripting and familiar with programming - shell scripts support functions.

Example:

Code:

!#/bin/bash

# Function to extract IP address
extract_ip () {
     ifconfig eth0 | grep | sed | etc...
}

# Set shell variable IP to ip address
IP=`extract_ip`

km4hr · 01-17-2005, 10:17 AM

Good info guys. Very good info! Thank you, very much.