Read password from stdin

read_password.sh

#!/bin/bash
unset password
prompt="Secret Password:"
while IFS= read -p "$prompt" -r -s -n 1 char
do
    if [[ $char == $'\0' ]]
    then
        break
    fi
    #prompt='*' # to show * for every keystroke
    prompt=''
    password+="$char"
done

#echo "your password is: $password"