Day 3: Mastering Basic Linux Commands in Your DevOps Journey

Introduction: 🚀 Welcome to Day 3 of our 90 Days of DevOps challenge! Today, we dive into the world of basic Linux commands, an essential skill for every DevOps enthusiast. Linux commands empower us to navigate, manipulate, and interact with the operating system efficiently. Let's explore some fundamental commands that will boost your Linux proficiency.

Task 1: View the content of a file To view the contents of a file, we can use the "cat" command. It displays the entire file content on the terminal. Command: cat filename

Task 2: Change the access permissions of files The "chmod" command allows you to modify the access permissions of files and directories, granting or restricting read, write, and execute privileges. Command: chmod permissions filename

Task 3: Check command history To recall the commands you have previously executed, use the "history" command. It displays a list of recently used commands with their line numbers. Command: history

Task 4: Remove a directory/folder To remove a directory or folder, we use the "rmdir" command. Please note that the directory must be empty for successful removal. Command: rmdir directoryname

Task 5: Create and view the content of a file To create a file, we can use the "vim" command or any text editor of your choice. After creating the file, you can view its content using the "cat" command. Commands:

vim filename
cat filename

Task 6: Show top/bottom lines of a file To display only the top or bottom lines of a file, we have the "head" and "tail" commands. "head" shows the top lines, while "tail" displays the bottom lines. Commands:

head -n 3 filename
tail -n 3 filename

Task 7: Find the difference between files To find the differences between two files, the "diff" command comes in handy. It highlights the lines that differ between the files. Command: diff file1 file2

Congratulations on completing today's tasks! Keep practicing these Linux commands to enhance your DevOps skills and streamline your workflow.

Stay tuned for Day 4, where we'll delve into the exciting world of containerization with Docker.

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