getips

getips.sh

#!/bin/bash

if [ "$#" -ne 2 ]; then
        echo "Usage: $0 [N] [IPv4]"
        exit 1
fi

N=$1
IP=$2

IFS='.' read -r octet1 octet2 octet3 octet4 <<< "$IP"

if [ "$octet4" -lt 0 ] || [ "$octet4" -gt 255 ]; then
        echo "Invalid IP address."
        exit 1
fi

if [ "$N" -eq 0 ] || [ "$octet4" -eq 0 ]; then
        exit 0
fi

first_usable=1
count=0

for i in $(seq $first_usable 254); do
        current_ip="$octet1.$octet2.$octet3.$i"

        echo "$current_ip"

        count=$((count + 1))

        if [ "$i" -eq "$octet4" ] || [ "$count" -eq "$N" ]; then
                break
        fi
done