shell_script

#!/bin/bash

get_whois() { # directory, url as arguments
    if [[ "$2" =~ ^https?:\/\/.*$ ]];
    then
        domain=$(echo $2 | awk -F[/:] '{print $4}')
    else
        domain=$2
    fi
    domain=${domain/www./ }
    filename=${domain//./_}
    wget --output-document="$1/${filename}.html" "https://www.whois.com/whois/${domain}"
}

if [ ! $# == 3 ]; then
    echo "Incorrect input"
    exit

if [ "$2" == "domain" ];
then
    get_whois "$1" "$3"
elif [ "$2" == "file" ];
then
    cat "$3" | while read line
    do
        get_whois "$1" "$line"
    done
else
    echo "Incorrect input"
    exit
fi