GIT -This is quick tip, howto get internal address and external address on Shell / Line. This guide also show, howto make useful Bash functions to get IP addresses quickly.

Note: All functions could be named as you wish and to make functions permanent, add functions to ~/.bashrcor /etc/bashrc. Also all awk commands should work also with gawk and nawk.

1. Get Internal IP Address(es) on Linux Shell / Command Line

1.1 Get Single IP Address by Interface

Returns plain IP address.

/sbin/ifconfig $1 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'

## Example usage ##
/sbin/ifconfig eth0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'
10.20.10.1

Create simple bash function (example int-ip) with following command.

function int-ip { /sbin/ifconfig $1 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'; }

## Example usage ##
int-ip eth0
10.20.10.1

1.2 Get Every Interfaces IP Address

Returns every interface and IP address pairs.

/sbin/ifconfig |grep -B1 "inet addr" |awk '{ if ( $1 == "inet" ) { print $2 } else if ( $2 == "Link" ) { printf "%s:" ,$1 } }' |awk -F: '{ print $1 ": " $3 }'

## Example output ##
eth0: 10.20.10.1
eth1: 10.20.1.168
lo: 127.0.0.1

Create simple bash function (example int-ips) with following command.

function int-ips { /sbin/ifconfig |grep -B1 "inet addr" |awk '{ if ( $1 == "inet" ) { print $2 } else if ( $2 == "Link" ) { printf "%s:" ,$1 } }' |awk -F: '{ print $1 ": " $3 }'; }

## Example usage ##
int-ips
eth0: 10.20.10.1
eth1: 10.20.1.168
lo: 127.0.0.1

2. Get External IP Address on Linux Shell / Command Line

I use here whatismyip.org service.

2.1 Get External IP Address Using Lynx

Returns plain IP address.

lynx --dump http://ipecho.net/plain

## Example output ##
80.10.10.80

Create simple bash function (example ext-ip) with following command.

function ext-ip () { lynx --dump http://ipecho.net/plain; }

## Example usage ##
ext-ip
80.10.10.80

2.2 Get External IP Address Using Curl

Returns plain IP address.

curl http://ipecho.net/plain; echo

## Example output ##
80.10.10.80

Create simple bash function (example ext-ip) with following command.

function ext-ip () { curl http://ipecho.net/plain; echo; }

## Example usage ##
ext-ip
80.10.10.80
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