shell-scripts/ipcalc at master · manumeter/shell-scripts · GitHub

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#!/bin/bash

help() {
	echo "Usage: ipcalc [HHHHHHHH | HH.H.HH.H | DDDDDDDDDDDD | DDD.DD.D.DDD]"
	echo "Convert IPv4-Adresses HEX <--> DEC"
	exit 1
}

[ "$1" == "--help" ] && help


if [[ $1 == *.*.*.* ]] ; then
	IN1=$(echo $1 | cut -d. -f1)
	IN2=$(echo $1 | cut -d. -f2)
	IN3=$(echo $1 | cut -d. -f3)
	IN4=$(echo $1 | cut -d. -f4)
elif [ ${#1} == 8 ] ; then
	IN1=${1:0:2}
	IN2=${1:2:2}
	IN3=${1:4:2}
	IN4=${1:6:2}
elif [ ${#1} == 12 ] ; then
	IN1=${1:0:3}
	IN2=${1:3:3}
	IN3=${1:6:3}
	IN4=${1:9:3}
else
	help
fi

if [ ${#IN1} == 3 ] || [ ${#IN2} == 3 ] || [ ${#IN3} == 3 ] || [ ${#IN4} == 3 ] ; then
	printf '%02x' "$IN1"
	printf '%02x' "$IN2"
	printf '%02x' "$IN3"
	printf '%02x\n' "$IN4"
else
	printf '%d.' "0x$IN1"
	printf '%d.' "0x$IN2"
	printf '%d.' "0x$IN3"
	printf '%d\n' "0x$IN4"
fi