#!/bin/bash --posix

# shellcheck disable=SC2120
read_sensitive() {
  # Securely read input into a variable
  #
  # Arguments:
  #   READVARIABLE <type: variable> <position: 1> <required: true>
  #     - A variable must be passed and the output of this function will be set to that variable
  #       e.g: read_sensitive MYVAR
  #
  # Usage:
  #  read_sensitive SOMEVAR
  #
  # POSIX Compliant:
  #   Yes
  #

  stty -echo
  local INPUT
  read -r INPUT
  stty echo
  printf "\n"
  eval "${1}=${INPUT}"
}

printf "Please input a password: " && read_sensitive PASSWORD_VARIABLE
echo "Received your password as ${PASSWORD_VARIABLE}"