ou're working on a Bash script that needs to validate user input for a password. The script should check if the password meets certain criteria: it should be at least 8 characters long, contain both uppercase and lowercase letters, and include at least one number. Which code snippet correctly implements this password validation using a while loop?0.5 Markswhile true; doread -sp "Enter password: " passwordif [[ ${#password} -lt 8 || ! "$password" =~ [a-z] || ! "$password" =~ [A-Z] || ! "$password" =~ [0-9] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidonewhile true; doread -sp "Enter password: " passwordif [[ ${#password} < 8 || ! "$password" =~ [a-z] || ! "$password" =~ [A-Z] || ! "$password" =~ [0-9] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidonewhile true; doread -sp "Enter password: " passwordif [[ ${#password} -lt 8 || ! "$password" =~ [[:lower:]] || ! "$password" =~ [[:upper:]] || ! "$password" =~ [0-9] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidonewhile true; doread -sp "Enter password: " passwordif [[ ${#password} -lt 8 || ! "$password" =~ [a-zA-Z] || ! "$password" =~ [0-9] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidonewhile true; doread -sp "Enter password: " passwordif [[ ${#password} < 8 || ! "$password" =~ [[:lower:]] || ! "$password" =~ [[:upper:]] || ! "$password" =~ [[:digit:]] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidone
Question
ou're working on a Bash script that needs to validate user input for a password. The script should check if the password meets certain criteria: it should be at least 8 characters long, contain both uppercase and lowercase letters, and include at least one number. Which code snippet correctly implements this password validation using a while loop?0.5 Markswhile true; doread -sp "Enter password: " passwordif [[ {#password} -lt 8 || ! "password" =~ [a-z] || ! "password" =~ [0-9] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidonewhile true; doread -sp "Enter password: " passwordif [[ {#password} < 8 || ! "password" =~ [a-z] || ! "password" =~ [0-9] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidonewhile true; doread -sp "Enter password: " passwordif [[ {#password} -lt 8 || ! "password" =~ [[:lower:]] || ! "password" =~ [0-9] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidonewhile true; doread -sp "Enter password: " passwordif [[ {#password} -lt 8 || ! "password" =~ [a-zA-Z] || ! "{#password} < 8 || ! "password" =~ [[:upper:]] || ! "$password" =~ [[:digit:]] ]]; thenecho "Invalid password. Please try again."elseecho "Password is valid."breakfidone
Solution
The correct code snippet for this password validation using a while loop in Bash is:
while true; do
read -sp "Enter password: " password
if [[ ${#password} -lt 8 || ! "$password" =~ [a-z] || ! "$password" =~ [A-Z] || ! "$password" =~ [0-9] ]]; then
echo "Invalid password. Please try again."
else
echo "Password is valid."
break
fi
done
This script works as follows:
-
The
while true; dostatement starts an infinite loop. The loop will continue until it is explicitly broken. -
The
read -sp "Enter password: " passwordstatement prompts the user to enter a password and stores the input in thepasswordvariable. The-soption hides the input and the-poption allows for a prompt string. -
The
ifstatement checks if the password meets the specified criteria. The${#password} -lt 8checks if the password is less than 8 characters long. The! "$password" =~ [a-z]checks if the password does not contain a lowercase letter. The! "$password" =~ [A-Z]checks if the password does not contain an uppercase letter. The! "$password" =~ [0-9]checks if the password does not contain a number. -
If the password does not meet any of the criteria, the script echoes "Invalid password. Please try again." and the loop continues.
-
If the password meets all the criteria, the script echoes "Password is valid." and the
breakstatement stops the loop.
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