#!/bin/bash

# Make sure the script is being executed with superuser privileges.
if [[ "${EUID}" -ne 0 ]]; then
   echo 'The script requires root priveledges'
   exit 1
fi

# supply at least one argument otherwise return an exit status of 1
if [[ "${#}" -lt 1 ]]
then
   echo "Usage: ${0} USER_NAME [COMMENT]..."
   echo "Create an account name USER_NAME with a comment field of COMMENT"
   exit 1
fi

# The first parameter is the user name.
USER_NAME = "${1}"
echo "${USER_NAME}"

# The rest of the parameters are for the account comments.
shift
COMMENT="${@}"

# Generate password.
PASSWORD=$(date +%s%N | sha256sum | head -c48)

# Create the user with the password.
useradd -c "${COMMENT}" -m ${USER_NAME}

# Check to see if the useradd command succeeded.
if [[ "${?}" -ne 0 ]]
then
  echo 'The account could not be created.'
  exit 1
fi

# Set the password.
echo ${PASSWORD} | passwd --stdin ${USER_NAME}

# Check to see if the passwd command succeeded.
if [[ "${?}" -ne 0 ]]
then
  echo 'The password for the account could not be set.'
  exit 1
fi

# Force password change on first login.
passwd -e ${USER_NAME}

# Display the username, password, and the host where the user was created.
echo 'username:'
echo "${USER_NAME}"
echo 'password:'
echo "${PASSWORD}"
echo 'host:'
echo "${HOSTNAME}"
exit 0