myip

#!/usr/bin/env bash
#
# Show current IP
#

get_external_ip() {
	IPINFO_FINGER="ip@ip.malte70.de"
	IPINFO_HTTP_API="https://ip.malte70.de/api.php/ip"
	
	#if [[ "$1" == "finger" ]]
	IP=""
	if which finger &>/dev/null
	then
		IP=$(finger $IPINFO_FINGER 2>/dev/null | grep -v '^\[' | head -n+2)
	fi
	if [[ -z "$IP" ]]
	then
		IP=$(curl -s $IPINFO_HTTP_API)
	fi
	echo $IP | tr -d "\n"
}

show_help() {
	echo "myip"
	echo -e "\tShows your current IP address"
	echo "Usage: myip [-4|-6|-g|-a|-x]"
	echo -e "Options\n\t-4\tShow IPv4 address"
	echo -e "\t-6\tShow IPv6 address"
	echo -e "\t-g\tShow global IP using ip.malte70.de API"
	echo -e "\t-a\tShow all informations at once"
	echo -e "\t-x\tExtended/expert output mode"
}
SHOW_IPv4="no"
SHOW_IPv6="no"
SHOW_GLOBAL="no"
SHOW_EXPERT="no"
if [ $# -eq 0 ]; then
	SHOW_IPv4="yes"
	SHOW_IPv6="no"
	SHOW_GLOBAL="no"
else
	if [ $1 == "--help" ]; then
		show_help
		exit 0
	elif [ $1 == "-4" ]; then
		SHOW_IPv4="yes"
	elif [ $1 == "-6" ]; then
		SHOW_IPv6="yes"
	elif [ $1 == "-g" ]; then
		SHOW_GLOBAL="yes"
	elif [ $1 == "-a" ]; then
		SHOW_IPv4="yes"
		SHOW_IPv6="yes"
		SHOW_GLOBAL="yes"
	elif [ $1 == "-x" ]; then
		SHOW_EXPERT="yes"
	fi
fi

# Detect ip info tool
if which ip &>/dev/null; then
	IP="`which ip` addr show"
else
	IP="`which ifconfig`"
fi

# Expert mode
if [ $SHOW_EXPERT == "yes" ]; then
	which ip &>/dev/null || {
		echo "$0: Error: \"ip\" not found in PATH!" >&2
		exit 1
	}
	ip addr                                          | \
		grep -E '(inet |inet6 | UP | UNKNOWN )'      | \
		awk '{ print $2 }'                           | \
		awk '/:$/{ print "§" $0 } /\//{ print $1 }'  | \
		cut -d/ -f1                                  | \
		tr "\n" " "                                  | \
		tr "§" "\n"                                  | \
		grep -v -E '(^|: )$'                         | \
		grep -v ': $'                                | \
		sed 's/:/: /'                                | \
		sort                                         | \
		sed 's/ \+/ /g'
	exit 0
fi
# IPv4
if [ $SHOW_IPv4 == "yes" ]; then
	IPv4=$($IP | grep inet\  |awk '{ print $2 }'  | cut -d/ -f1)
	{
		for IP in $IPv4; do
			echo $IP
		done
	} | sort | grep -v "127.0.0.1"
fi

# IPv6
if [ $SHOW_IPv6 == "yes" ]; then
	IPv6=$($IP | grep inet6\  |awk '{ print $2 }' | cut -d/ -f1 | cut -d% -f1)
	{
		for IP in $IPv6; do
			echo $IP
		done
	} | sort | grep -v "::1"
fi

# Global IP
if [ $SHOW_GLOBAL == "yes" ]; then
	echo $(get_external_ip)
fi