create_user.sh

#!/usr/bin/env bash
#
# Arguments:
# - username
# - user pass
# - user rsa pub key
#
# This script:
# - creates user with password
# - adds user into sudoers and sshusers group
# - adds user's public key into his ${HOME}/.ssh/authorized_keys
#
# created date:     02.2016
# last update date: 06.02.2017
# author:           @yugoslavskiy
#

user_name=$1
user_pass=$2
user_key=$3

# for base debian 8.4 instllation
apt-get -y install sudo curl tmux htop

# create user
useradd -m ${user_name}

# change password
passwd ${user_name} << EOF
${user_pass}
${user_pass}
EOF

# place pub key
mkdir /home/${user_name}/.ssh
echo ${user_key} > /home/${user_name}/.ssh/authorized_keys

# permission setup
chmod 600 /home/${user_name}/.ssh/authorized_keys
chmod 755 /home/${user_name}/.ssh
chown -R ${user_name}:${user_name} /home/${user_name}/.ssh/

# adding to groups
groupadd sshusers
usermod -a -G sshusers ${user_name}

echo "${user_name} ALL=(ALL) ALL" > /etc/sudoers.d/${user_name}
chmod 440 /etc/sudoers.d/${user_name}

# change default shell
chsh -s /bin/bash ${user_name}

exit 0