Question

The first script is validate.sh. This is a simple form validation script that will be used to verify the inputs given. Normally, this would be done to validate input from a website or another program before entry into a database or other record storage. In this case, we will keep it simple and only focus on the input validation step. In particular, the script should prompt the user for four values: first name, last name, zip code, and email address. Each input must be validated, meaning that the input conforms to a certain standard. Here is the standard for this assignment:

• The first name must start with a capital letter and contain only letters and hyphens.
• The last name must start with a capital letter and contain only letters and hyphens.
• The zip code must be exactly 5 digits and nothing else.
• The email address must be a valid email address format, meaning USER@DOMAIN, where both USER and DOMAIN must be only letters, numbers, dots, underscores, and hyphens.

As the script reads each value, use regular expressions to ensure that the value matches the standard above. If a value does not match the standard, print an error message and exit immediately (don't prompt for the rest of the inputs). If all four values are validated successfully, then print a message indicating that fact. Here are some sample runs:

[user@localhost lab3]$ ./validate.sh

First name: R2-D2

First name must start with a capital letter and contain only letters and hyphens!

[user@localhost lab3]$ ./validate.sh

First name: Han

Last name: S0L0

Last name must start with a capital letter and contain only letters and hyphens!

[user@localhost lab3]$ ./validate.sh

First name: Han

Last name: Solo

Zip code: 12 parsecs

Zip code must be exactly 5 digits!

[user@localhost lab3]$ ./validate.sh

First name: Han

Last name: Solo

Zip code: 12345

Email address: han.solo

Email address must be USER@DOMAIN, where both USER and DOMAIN must be only letters, numbers, dots, underscores, and hyphens!

[user@localhost lab3]$ ./validate.sh

First name: Han

Last name: Solo

Zip code: 12345

Email address: [email protected]

Validated!

[user@localhost lab3]$

Answer 1

#!/bin/bash

count=0

read -p "Enter the first name: " fname

echo

if [[ "$fname" =~ [A-Z][A-Za-z-]+$ ]]

then

count=`expr $count + 1`

else

echo "First name must start with a capital letter and contain only letters and hyphens!"

fi

read -p "Enter the last name: " lname

echo

if [[ "$lname" =~ [A-Z][A-Za-z-]+$ ]]

then

count=`expr $count + 1`

else

echo "Last name must start with a capital letter and contain only letters and hyphens!"

fi

read -p "Enter the zip code: " zipcode

echo

if [[ "$zipcode" =~ ^[0-9][0-9][0-9][0-9][0-9]$ ]]

then

count=`expr $count + 1`

else

echo "Zip code must be exactly 5 digits!"

fi

read -p "Enter the email ID: " email

echo

if [[ "$email" =~ ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$ ]]

then

count=`expr $count + 1`

else

echo "Email address must be USER@DOMAIN, where both USER and DOMAIN must be only letters, numbers, dots, underscores, and hyphens!"

fi

if [ $count == 4 ]

then

echo "Validated!"

fi

Save this as validate.sh

Run as: bash validate.sh (or) ./validate.sh

OUTPUT:

Let me know in the comments section if you have any doubts.