75.Shell_Project_01.md

Project 1: Secret Agent Application

Rules:

1. The first character of the Name should be 'd'.
2. The last character of the Favourite Actor should be 'r'.
3. The Lucky Number should be 7.
4. The number of characters in the Favourite Dish should be >= 6.

If the above conditions are satisfied, the user is a valid secret agent and will receive information about the next operation. Otherwise, the application will send a "thanks" message.

Version-1 (Performance-wise not up to the mark)

#! /bin/bash
echo "Welcome to Secret Agent Application"
echo "####################################"

read -p "Enter Your Name:" name
read -p "Enter Your Favourite Actor:" actor
read -p "Enter Your Lucky Number:" lucky
read -p "Enter Your Favourite Dish:" dish

first_char_name=$(echo -n $name | cut -c 1)
len=$(echo -n $actor | wc -c)
last_char_actor=$(echo -n $actor | cut -c $len)
no_of_characters_dish=$(echo -n $dish | wc -c)

if [ $first_char_name = "d" -a $last_char_actor = "r" -a $lucky -eq 7 -a $no_of_characters_dish -ge 6 ]; then
    echo "Hello Secret Agent...Our Next Operation is"
    echo "We have to kill at least 10 sleeping students of the classroom because they are a burden to the country"
else
    echo "Hello $name, thanks for your information"
fi

Version-2 (Improved performance-wise)

#! /bin/bash
echo "Welcome to Secret Agent Application"
echo "####################################"

read -p "Enter Your Name:" name
first_char_name=$(echo -n $name | cut -c 1)
if [ $first_char_name != "d" ]; then
    echo "Hello $name, thanks for your information"
    exit 1
fi

read -p "Enter Your Favourite Actor:" actor
len=$(echo -n $actor | wc -c)
last_char_actor=$(echo -n $actor | cut -c $len)
if [ $last_char_actor != "r" ]; then
    echo "Hello $name, thanks for your information"
    exit 1
fi

read -p "Enter Your Lucky Number:" lucky
if [ $lucky -ne 7 ]; then
    echo "Hello $name, thanks for your information"
    exit 1
fi

read -p "Enter Your Favourite Dish:" dish
no_of_characters_dish=$(echo -n $dish | wc -c)
if [ $no_of_characters_dish -lt 6 ]; then
    echo "Hello $name, thanks for your information"
    exit 1
fi

echo "Hello Secret Agent...Our Next Operation is"
echo "We have to kill at least 10 sleeping students of the classroom because they are a burden to the country"

---

Output:

durga@durga-VirtualBox:~/scripts$ test.sh
Welcome to Secret Agent Application
####################################
Enter Your Name:durga
Enter Your Favourite Actor:Ameer
Enter Your Lucky Number:7
Enter Your Favourite Dish:Fish
Hello durga, thanks for your information

durga@durga-VirtualBox:~/scripts$ test.sh
Welcome to Secret Agent Application
####################################
Enter Your Name:durga
Enter Your Favourite Actor:Ameer
Enter Your Lucky Number:7
Enter Your Favourite Dish:Mutton
Hello Secret Agent...Our Next Operation is
We have to kill at least 10 sleeping students of the classroom because they are a burden to the country