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This is quick tip, howto get internal IP address and external IP address on Linux Shell / Command 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 ~/.bashrc or /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 IP and IPv6 Address by Interface⌗

Returns plain IP addresses.

/sbin/ifconfig $1 | grep "inet\|inet6" | awk -F' ' '{print $2}' | awk '{print $1}'

## Example usage ##
/sbin/ifconfig eth0 | grep "inet\|inet6" | awk -F' ' '{print $2}' | awk '{print $1}'
10.20.10.1
0:0:0:0:0:ffff:a14:a01

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

function int-ip { /sbin/ifconfig $1 | grep "inet\|inet6" | awk -F' ' '{print $2}' | awk '{print $1}'; }

## Example usage ##
int-ip eth0
10.20.10.1
0:0:0:0:0:ffff:a14:a01

1.2 Get Every Interfaces IP and IPv6 Addresses⌗

Returns every interface IP and IPv6 addresses.

/sbin/ifconfig |grep -B1 "inet\|inet6" |awk '{ if ( $1 == "inet" || $1 == "inet6" ) { print "  ",$2 } else if ( $1 != "inet" && $1 != "inet6" ) { print $1 } }'

## Example output ##
lo:
   127.0.0.1
   ::1
--
eth0:
   192.168.1.11
   fe80::3a2c:4aff:fe48:2a55

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

function int-ips { /sbin/ifconfig |grep -B1 "inet\|inet6" |awk '{ if ( $1 == "inet" || $1 == "inet6" ) { print "  ",$2 } else if ( $1 != "inet" && $1 != "inet6" ) { print $1 } }'; }

## Example usage ##
int-ips
lo:
   127.0.0.1
   ::1
--
eth0:
   192.168.1.11
   fe80::3a2c:4aff:fe48:2a55

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

I use here ipecho.net 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