Create multiple Unix users with permissions

user-creation-function.sh

# Run as ROOT: $ sudo su

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

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

@PTECH_SETUP_USER() {
  ##########
  # Config #
  ##########

  # Required
  PTECH_SETUP_USER_NAME="$1"

  # Optional
  PTECH_SETUP_GROUP_ADMIN_NAME="$2"

  # Optional
  PTECH_SETUP_SSH_PUB="$3"


  #################
  # 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
}

@PTECH_SETUP_USER \
  'user1' \
  'sysadmin' \
  'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABA...3gF0pnPgy4rEsJQZ user1@mail.com'

@PTECH_SETUP_USER \
  'user2' \
  'sysadmin' \
  'ssh-rsa AAAAB3NzaC1yc2EA...9ei+Nzc4oSwtHRb user2@mail.com'

@PTECH_SETUP_USER \
  'user3' \
  'sysadmin' \
  'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABA...PbsbyFaNyNaCgp7Wv user3@mail.com'