Create Unix user with permissions

user-creation.sh

# Run as ROOT: $ sudo su
(
##########
# Config #
##########

# Required
PTECH_SETUP_USER_NAME=username

# Optional
PTECH_SETUP_GROUP_ADMIN_NAME=sysadmin

# Optional
PTECH_SETUP_SSH_PUB='ssh-rsa AAAAB3NzaC1...FaNyNaCgp7Wv username@patagonian.it'


#########
# Utils #
#########

@log() {
  echo "# $*"
}


#################
# User creation #
#################

@log Create user ${PTECH_SETUP_USER_NAME}
useradd --create-home -s /bin/bash ${PTECH_SETUP_USER_NAME}


#######
# SSH #
#######

if [ ! -z "${PTECH_SETUP_SSH_PUB}" ]; then
  @log Setup SSH...

  mkdir /home/${PTECH_SETUP_USER_NAME}/.ssh
  echo "${PTECH_SETUP_SSH_PUB}" >> /home/${PTECH_SETUP_USER_NAME}/.ssh/authorized_keys
  chown -R ${PTECH_SETUP_USER_NAME}:${PTECH_SETUP_USER_NAME} /home/${PTECH_SETUP_USER_NAME}/.ssh
  chmod 700 /home/${PTECH_SETUP_USER_NAME}/.ssh
  chmod 640 /home/${PTECH_SETUP_USER_NAME}/.ssh/authorized_keys
fi


###############
# Admin Group #
###############

if [ ! -z "${PTECH_SETUP_GROUP_ADMIN_NAME}" ]; then
  PTECH_SETUP_SUDO_LINE_KEY="%${PTECH_SETUP_GROUP_ADMIN_NAME}"
  PTECH_SETUP_SUDO_LINE="${PTECH_SETUP_SUDO_LINE_KEY}        ALL=(ALL:ALL)       NOPASSWD: ALL"
  PTECH_SETUP_SUDO_FILE="/etc/sudoers.d/${PTECH_SETUP_GROUP_ADMIN_NAME}"

  @log Create ${PTECH_SETUP_GROUP_ADMIN_NAME} group...
  groupadd ${PTECH_SETUP_GROUP_ADMIN_NAME}

  @log Add ${PTECH_SETUP_USER_NAME} to group ${PTECH_SETUP_GROUP_ADMIN_NAME}...
  usermod -aG ${PTECH_SETUP_GROUP_ADMIN_NAME} ${PTECH_SETUP_USER_NAME}

  touch ${PTECH_SETUP_SUDO_FILE}

  if grep -q "${PTECH_SETUP_SUDO_LINE_KEY}" ${PTECH_SETUP_SUDO_FILE}
    then
      @log ${PTECH_SETUP_SUDO_FILE} already configured
    else
      @log Add line "'${PTECH_SETUP_SUDO_LINE}'" to ${PTECH_SETUP_SUDO_FILE}
      echo "${PTECH_SETUP_SUDO_LINE}" >> ${PTECH_SETUP_SUDO_FILE}

      # WARNING! If next is actived, Copy & Paste the function call ONE BY ONE!
      #visudo -f ${PTECH_SETUP_SUDO_FILE}
    fi
fi
)