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Phase 1: Linux Bash and Networking

Author: GPS

How does this phase apply to Cloud?

The cloud is essentially a collection of networked Linux servers. Understanding networking fundamentals and how to interact with these servers via commands and automate those commands with scripts is crucial. If you're already a Linux admin or network engineer, you can apply your skills to the cloud directly.


  • Create a GitHub account: Along side learning to script and later on to to code (though scripting is code), you'll need leverage Git, the most popular version control tool and a core DevOps practice. Git is used to manage and share your code, and GitHub is a leading repository hosting service.

How to break down this phase

1Introduction to Bash
2Introduction to Networking


BashLinux Basics for HackersThis book made learning Linux FUN! It's pretty easy to follow and take a chapter day by day.You don't need to read the whole thing, the first 9 chapters cover most of what you need to know.
Bash for BeginnersYouTube Video SeriesAn introduction to Bash!A 20 part YouTube series covering the fundamentals of Bash.
NetworkingComputer Networking Course - Network EngineeringYou'll learn the fundamental principles of computer networking to prepare you for cloud.

Capstone Project: CloudUploader CLI

Create a bash-based CLI tool that allows users to quickly upload files to a specified cloud storage solution, providing a seamless upload experience similar to popular storage services.

Your tool should be able to upload a file:

clouduploader /path/to/file.txt


  1. Create a GitHub Repo:

    • Set up a repository for your project.
    • Use branches and commit your code often.
    • Utilize git commands (git init, git add, git commit, git branch, git push, etc.).
  2. Setup & Authentication:

    • Choose a cloud provider (e.g., AWS S3, Google Cloud Storage, Azure Blob Storage).
    • Set up authentication (e.g., az login for Azure).
    • Use secure methods for handling credentials.
      • Avoid hardcoding credentials directly into the script.
      • Store credentials in environment variables or configuration files with restricted access.
      • Utilize cloud provider's secure authentication methods (e.g., IAM roles for AWS, service principals for Azure).
  3. CLI Argument Parsing:

    • Use bash's built-in $1, $2, etc., to parse command-line arguments.
    • $1 could be the filename or path.
    • Optionally, allow additional arguments like target cloud directory, storage class, or any other cloud-specific attributes.
    • Validate and handle different types of input.\
      • Check if the provided file path is valid and accessible.
      • Ensure that additional arguments meet expected formats and values.
      • Provide meaningful error messages for incorrect or missing inputs
  4. File Check:

    • Before uploading, check if the file exists using [ -f $FILENAME ].
    • Provide feedback if the file is not found.
  5. File Upload:

    • Use the cloud provider's CLI to upload the file.
    • Implement error handling to manage potential issues during upload.
  6. Upload Feedback:

    • On successful upload, provide a success message.
    • If there's an error, capture the error message and display it to the user.
  7. Advanced Features (Optional but recommended):

    • Add a progress bar or percentage upload completion using tools like pv.
    • Provide an option to generate and display a shareable link post-upload.
    • Enable file synchronization -- if the file already exists in the cloud, prompt the user to overwrite, skip, or rename.
    • Integrate encryption for added security before the upload.
  8. Documentation:

    • Write a file explaining how to set up, use, and troubleshoot the tool.
    • Include a brief overview, prerequisites, usage examples, and common issues.
  9. Distribution:

    • Package the script for easy distribution and installation. You can even provide a simple installation script or instructions to add it to the user's $PATH.

Things you should be able familiar with at the end of this phase


  • Navigate with the cd command.
  • How to list the contents of a directory and using the ls command.
  • Create, copy, move, rename, directories and files with mkdir, cp, rm, and touch commands.
  • Find things with locate, whereis, which, and find commands.
  • Understand how to learn more about commands with the which, man, and --help commands.
  • Familiar with finding logs details in /var/log
  • How to display the contents of a file with cat, less, more, tail, head.
  • Filtering with grep and sed.
  • Redirection of standard input, output and error with > operator and tee command.
  • How to use pipelines with the | operator.
  • Manipulate files with nano or vim.
  • Install and uninstall packages. Depends on distro, debian based use apt.
  • Control permissions with chown, chgrp, chmod commands.
  • Creating users and the sudo command.
  • Process management with ps, top, nice, kill
  • Manage environment aud user defined variables with env, set, export commands.
  • Add directories to your PATH.
  • Compression and archiving with tar, gzip, gunzip.
  • How to access a Linux server with ssh.


Concepts you should be familiar with.

  • OSI Model
  • IP Addresses
  • MAC Addresses
  • Routing and Switching
  • TCP/IP
  • TCP and UDP
  • DNS
  • VPN tunneling
  • TLS and SSL

Bash Scripting

  • What is a shell?
  • What is Bash?
  • Why does a script have to start with #!?
  • What is a variable and how to use them
  • How to accept user input
  • How to execute a script

Certifications you might want to look into

These certifications provide a comprehensive foundation but are not mandatory for entry-level cloud roles.