0x04-loops_conditions_and_parsing

Loops, conditions and parsing

General Objectives:

• How to create SSH keys
• What is the advantage of using #!/usr/bin/env bash over #!/bin/bash
• How to use while, until and for loops
• How to use if, else, elif and case condition statements
• How to use the cut command
• What are files and other comparison operators, and how to use them

General Requirement

• Allowed editors: vi, vim, emacs
• All your files will be interpreted on Ubuntu 20.04 LTS
• All your files should end with a new line
• A README.md file, at the root of the folder of the project, is mandatory
• All your Bash script files must be executable
• You are not allowed to use awk
• Your Bash script must pass Shellcheck (version 0.7.0) without any error
• The first line of all your Bash scripts should be exactly #!/usr/bin/env bash
• The second line of all your Bash scripts should be a comment explaining
• what is the script doing

Mandatory Tasks

In this project, I was able to complete the following tasks:

0. Create a SSH RSA key pair

Share your public key in your answer file 0-RSA_public_key.pub

1. For Best School loop

Write a Bash script that displays Best School 10 times.

Requirement:

• You must use the for loop (while and until are forbidden)

2. While Best School loop

Write a Bash script that displays Best School 10 times.

Requirements:

• You must use the while loop (for and until are forbidden)

3. Until Best School loop

Write a Bash script that displays Best School 10 times.

Requirements:

• You must use the until loop (for and while are forbidden)

4. If 9, say Hi!

Write a Bash script that displays Best School 10 times, but for the 9th iteration, displays Best School and then Hi on a new line.

Requirements:

• You must use the while loop (for and until are forbidden)
• You must use the if statement

5. 4 bad luck, 8 is your chance

Write a Bash script that loops from 1 to 10 and:

• displays bad luck for the 4th loop iteration
• displays good luck for the 8th loop iteration
• displays Best School for the other iterations

Requirements:

• You must use the while loop (for and until are forbidden)
• You must use the if, elif and else statements

6. Superstitious numbers

Write a Bash script that displays numbers from 1 to 20 and:

• displays 4 and then bad luck from China for the 4th loop iteration
• displays 9 and then bad luck from Japan for the 9th loop iteration
• displays 17 and then bad luck from Italy for the 17th loop iteration

Requirements:

You must use the while loop (for and until are forbidden) You must use the case statement

7. Clock

Write a Bash script that displays the time for 12 hours and 59 minutes:

• display hours from 0 to 12
• display minutes from 1 to 59

Requirements:

• You must use the while loop (for and until are forbidden)

8. For ls

Write a Bash script that displays:

• The content of the current directory
• In a list format
• Where only the part of the name after the first dash is displayed

Requirements:

• You must use the for loop (while and until are forbidden)
• Do not display hidden files

9. To file, or not to file

Write a Bash script that gives you information about the school file.

Requirements:

• You must use if and, else (case is forbidden)
• Your Bash script should check if the file exists and print:
  • if the file exists: school file exists
  • if the file does not exist: school file does not exist
• If the file exists, print:
  • if the file is empty: school file is empty
  • if the file is not empty: school file is not empty
  • if the file is a regular file: school is a regular file
  • if the file is not a regular file: (nothing)

10. FizzBuzz

Write a Bash script that displays numbers from 1 to 100.

Requirements:

• Displays FizzBuzz when the number is a multiple of 3 and 5
• Displays Fizz when the number is multiple of 3
• Displays Buzz when the number is a multiple of 5
• Otherwise, displays the number
• In a list format

Advanced Tasks

11. Read and cut

help: read

Write a Bash script that displays the content of the file /etc/passwd.

Your script should only display:

• username

• user id

• Home directory path for the user Requirements:

• You must use the while loop (for and until are forbidden)

12. Tell the story of passwd

13. Let's parse Apache logs

14. Dig the data