Practical-tasks

This repository contains a set of Bash scripting tasks that demonstrate various programming concepts, from implementing mathematical functions to file manipulation and system reporting.

Task Descriptions

Task 1: Fibonacci Sequence Function

The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding ones. In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation: Fn = Fn-1 + Fn-2 With the following seed values: F0 = 0 and F1 = 1 Write a function fib that returns Fn based on the input integer n:

• If n = 0, fib should return 0
• If n = 1, fib should return 1
• If n > 1, it should return Fn-1 + Fn-2

Task 2: Arithmetic Operations Script

Create a Bash script that accepts the following parameters:

-o : Specifies the operation to be performed (+, -, *, %)

-n : A sequence of numbers on which the operation will be performed

-d: (Optional) Debug flag to print additional information

For example:

./your_script.sh -o % -n 5 3 -d  # Result: 2

./your_script.sh -o + -n 3 5 7 -d  # Result: 15

If the -d flag is passed, the script must print:

• User: The username of the user running the script
• Script: The script name
• Operation: The operation to be performed
• Numbers: All space-separated numbers in the input sequence

Task 3: FizzBuzz Script

Write a script that prints the numbers from 1 to 100 with the following conditions:

• If a number is a multiple of 3, print "Fizz" instead of the number
• If a number is a multiple of 5, print "Buzz" instead of the number
• If a number is a multiple of both 3 and 5, print "FizzBuzz"

Task 4: Caesar Cipher Script

Write caesar cipher script accepting three parameters -s < shift > -i < input file > -o < output file >

Task 5: Text Manipulation Script

Write script with following functionality:

• If -v tag is passed, replaces lowercase characters with uppercase and vise versa
• If -s is passed, script substitutes <A_WORD> with <B_WORD> in text (case sensitive)
• If -r is passed, script reverses text lines
• If -l is passed, script converts all the text to lower case
• If -u is passed, script converts all the text to upper case
• Script should work with -i -o tags

Task 6: System Report Script

Write a script that generates a system report containing the following information:

• Current date and time
• Name of the current user
• Internal IP address and hostname
• External IP address
• Name and version of the Linux distribution
• System uptime
• Information about used and free space in / (in GB)
• Information about total and free RAM
• Number and frequency of CPU cores

Usage

Each task is contained in its respective script file (e.g., task1.sh, task2.sh, etc.). Refer to the comments within each script for specific usage instructions.

Folder Structure

The following files are associated with each task:

task4: task4.sh, input.txt, output.txt

task5: task5.sh, input2.txt, output2.txt

Instructions for Running Scripts

Make each script executable using:

chmod u+x <script_name>.sh

Run the script using the instructions provided for each task.