Create user with proper authorized_keys file

create_user_with_cloned_authorized_keys_from_root.sh

#!/usr/bin/env bash

## Bash docs:
##
## Create user with authorized_keys copied from root user

NEW_USER_NAME="$1"

if [ "x${NEW_USER_NAME}" == "x" ]; then
  echo "Usage:"
  echo "${0} [new_user_name] [shell like /bin/bash or /bin/sh *]"
  exit 1
fi

CHMOD=`which chmod`
CHOWN=`which chown`
CP=`which cp`
MKDIR=`which mkdir`
SUDO=`which sudo`
USERADD=`which useradd`
VISUDO=`which visudo`

NEW_USER_SHELL="${2:-/bin/bash}"
FROM_USER_PATH="/root"

${USERADD} -d /home/${NEW_USER_NAME} -s /bin/bash -m ${NEW_USER_NAME} && \
${MKDIR} /home/${NEW_USER_NAME}/.ssh && \
${CHOWN} ${NEW_USER_NAME}:${NEW_USER_NAME} /home/${NEW_USER_NAME}/.ssh && \
${CHMOD} 700 /home/${NEW_USER_NAME}/.ssh && \
${CP} ${FROM_USER_PATH}/.ssh/authorized_keys /home/${NEW_USER_NAME}/.ssh && \
${CHOWN} ${NEW_USER_NAME}:${NEW_USER_NAME} /home/${NEW_USER_NAME}/.ssh/authorized_keys && \
${CHMOD} 600 /home/${NEW_USER_NAME}/.ssh/authorized_keys

echo "${NEW_USER_NAME} ALL=(ALL) NOPASSWD: ALL" | ${SUDO} EDITOR='tee -a' ${VISUDO}