# Write shell script to implement terminal locking (similar to lock command). It should prompt the user for password. After accepting the password entered by the user, it must prompt again for matching password as confirmation and if match occurs, it must the lock the keyboard until a matching password is entered again by the user, Note that the script must be written to disregard BREAK, control-D. No time limit need be implemented for the lock duration.in

#!/bin/sh
clear
f=1
echo -e "Enter password: \c"
read -s password1
echo -e "\nRe-enter password: \c"
read -s password2

if [ $password1 == $password2 ]; then
    echo -e "\n\nMatch found"
else
    while [ 1 ]
    do
        if [ $f -eq 3 ]; then
            echo -e "\n\nWrong password"
            exit
        else
            echo -e "\n\nEnter password: \c"
            read -s password1
            echo -e "\nRe-enter password: \c"
            read -s password2
            if [ $password1 == $password2 ]; then
                echo -e "\n\nMatch found"
                exit
            fi
            f=`expr $f + 1`
        fi
    done
fi