Write a program to accept username and password as input arguments without displaying the password.

#!/bin/bash

unset PASSWORD
unset CHARCOUNT

echo -n "Login:";
read login_name;
echo -n "Enter password: "

stty -echo

CHARCOUNT=0
while IFS= read -p "$PROMPT" -r -s -n 1 CHAR
do
    # Enter - accept password
     if [[ $CHAR == $'\0' ]] ; then
         break
     fi
     # Backspace
     if [[ $CHAR == $'\177' ]] ; then
         if [ $CHARCOUNT -gt 0 ] ; then
            CHARCOUNT=$((CHARCOUNT-1))
            PROMPT=$'\b \b'
            PASSWORD="${PASSWORD%?}"
         else
            PROMPT=''
         fi
     else
         CHARCOUNT=$((CHARCOUNT+1))
         PROMPT='*'
         PASSWORD+="$CHAR"
     fi
done
stty echo

if [[ $login_name == "pearl"  && $PASSWORD == "pearlyperl" ]] ; then
    echo -e "\n Login Successful  :-)  \n";
else
    echo -e "Login Failed \n";
fi

OUPUT:

./login.sh

Login:pearl

Enter password: **********

Login Successful :-)