wimip

#!/bin/sh

### WIMIP
### A helper script to easily report both local and public IP addresses of a device on commandline

### Kieran Bingham 2015
### www.kieranbingham.co.uk

IFACE=`route -n | grep ^0.0.0.0 | awk '{ print $8 }'`

show_help() {
cat << EOF
Usage: ${0##*/} [-hlpq] [iface]
What Is My IP? ... I'm glad you asked.

    -h     display this help and exit
    -l     display locally native IP address based on current default routing
    -p     display publicly visible, external IP address
    -q     act quietly ... just print IP addresses without 'prompts'
    iface  display IP address of iface (Default $IFACE) (implies act quietly)

EOF
}

# Default to displaying 'useful' information
quiet=echo
native_ip=yes
public_ip=yes

# Scripts can call with options to get specific information

OPTIND=1
while getopts "hlpq" opt; do
    case "$opt" in
        h)
            show_help
            exit 0
            ;;
        l)  native_ip=yes
            public_ip=no
            quiet=true
            ;;
        p)  public_ip=yes
            native_ip=no
            quiet=true
            ;;
        q)  quiet=true
            ;;
        '?')
            show_help >&2
            exit 1
            ;;
    esac
done
shift "$((OPTIND-1))" # Shift off the options and optional --.

# Deal with optionally specified interface
if [ $1 ]
then
  IFACE=${1:-$IFACE}
  quiet=true
  native_ip=yes
  public_ip=no
fi

# Discover some addresses
NATIVE_IP=`ifconfig $IFACE | sed -r -e '/.*inet\s*(addr:)*(([0-9]{1,3}\.){3}[0-9]{1,3}).*/!d;s//\2/'`
PUBLIC_IP=`dig +short myip.opendns.com @resolver1.opendns.com`
# V2. Display all IP addresses:         ifconfig | sed -r -e '/.*inet\s*(addr:)*(([0-9]{1,3}\.){3}[0-9]{1,3}).*/!d;s//\2/';

if [ "$native_ip" = yes ]
then
        $quiet -n "$IFACE: "
        echo $NATIVE_IP
fi

if [ "$public_ip" = yes ]
then
        $quiet -n "public: "
        echo $PUBLIC_IP
fi