Add entries /etc/hosts temporally

hostsm

#! /bin/sh

if [ "$1" == "-e" ]; then
    "${EDITOR:-vi}" hosts
    exit;
fi

if [ "$1" == "-r" ]; then
    if [ -e hosts ]; then
        read -p "Remove temporal hosts (Y/n)? " choice
        case "$choice" in
        n|N ) echo "Not deleted";;
        * ) rm hosts;;
        esac
    else
        echo "Temporal hosts doesn't exists";
    fi
    exit;
fi

sudo -v

# Keep-alive sudo
while true; do sudo -n true; sleep 60; kill -0 "$$" || exit; done 2>/dev/null &

exit_script() {
    echo "\n\nRestoring old hosts file\n"
    sudo cp -f /etc/hosts.bak /etc/hosts

    read -p "Remove temporal hosts (Y/n)? " choice
    case "$choice" in
      n|N ) echo "Not deleted";;
      * ) rm hosts;;
    esac

    trap - SIGINT SIGTERM
    kill -- -$$
}

trap exit_script SIGINT SIGTERM

sudo cp -f /etc/hosts /etc/hosts.bak;

if [ -z "$1" ]; then
    empty=1;
else
    empty=0;
    org=$1;
fi

if [ -z "$2" ]; then
    dst="127.0.0.1";
else
    dst=$2;
fi

if [ -e hosts ]; then
    diff hosts /etc/hosts.bak |
        tail +2 |
        awk '{$1=""}1' |
        awk '{$1=$1}1' |
        awk '{ for (i=NF; i>1; i--) printf("%s ",$i); print $1; }' |
        sed -r 's/ / --> /g' |
        sed -e 's/^/Adding (old) /';
else
    cat /etc/hosts > hosts;
    if [ $empty -eq 1 ]; then
        echo "Nothing added :(";
        rm hosts;
        sudo cp -f /etc/hosts.bak /etc/hosts;
        exit;
    fi
fi

if [ $empty -eq 0 ]; then
    echo "Adding $org --> $dst";
    echo $dst $org >> hosts;
fi
sudo cp -f hosts /etc/hosts;

while true; do sleep 600; done;