add user linux with root access, empty ssh key and permissions all set

add_user.sh

#!/bin/bash

if id "$1" >/dev/null 2>&1; then
        echo "user exists"
else
        echo "user does not exist, creating"
        useradd -c "$1 last" $1 -m
fi

echo "$1 ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers

su - $1  -c "mkdir .ssh"
su - $1  -c "chmod 700 .ssh"
su - $1  -c "touch .ssh/authorized_keys"
su - $1  -c "chmod 600 .ssh/authorized_keys"
su - $1  -c "chown -R $1:$1 .ssh"