Day 8 Task: Shell Scripting Challenge

Task 1: Comments

In bash scripts, comments are used to add explanatory notes or disable certain lines of code. Your task is to create a bash script with comments explaining what the script does.

Make a file named task1.sh and insert the script:

  #!/bin/bash

  # This script prints about what comment does

  echo "The comment (#) are added with the purpose of making the source code easier for humans to understand, and are generally ignored by compilers and interpreters"

Make this file executable:

chmod 700 task1.sh

Execute the script:

./task1.sh

Task 2: Echo

The echo command is used to display messages on the terminal. Your task is to create a bash script that uses echo to print a message of your choice.

#!/bin/bash

echo "Hello, this is my Day 8 of 90DaysOfDevOPs challenge"

Run the script.

Task 3: Variables

Variables in bash are used to store data and can be referenced by their name. Your task is to create a bash script that declares variables and assigns values to them.

#!/bin/bash

name="Rakshita"
challenge="90DaysOfDevOps challenge"

echo "Hello, my name is $name and this is my day 8 of $challenge"

Run the script.

Task 4: Using Variables

Now that you have declared variables, let's use them to perform a simple task. Create a bash script that takes two variables (numbers) as input and prints their sum using those variables.

#!/bin/bash

num1=6
num2=9
sum=$((num1 + num2))

echo "The sum of $num1 and $num2 is $sum"

Run the script.

Task 5: Using Built-in Variables

Bash provides several built-in variables that hold useful information. Your task is to create a bash script that utilizes at least three different built-in variables to display relevant information.

#!/bin/bash

echo "Current user: $USER"

echo "Home directory: $HOME"

echo "Current working directory: $PWD"

Task 6: Wildcards

Wildcards are special characters used to perform pattern matching when working with files. Your task is to create a bash script that utilizes wildcards to list all the files with a specific extension in a directory.

Make few .txt files in current directory:

touch file1.txt file2.txt

Create another new file:

vim task6.sh

Enter the script:

#!/bin/bash

echo "Listing all .txt files in current directory"
ls *.txt

Make this file executable:

chmod 700 task6.sh

Run the script:

./task6.sh

Conclusion

In this series of tasks, we explored some fundamentals of bash scripting including comments, echo, commands,variables, build-in-variables and wildcards. This foundation euips us with the skills to write more complex and functional bash scripts, facilitating efficient and automated tasks in a Unix-like environment.

Happy learning!🚀