description	The most critical software that runs on a computer is an operating system (OS).
icon	terminal

Welcome | Course Introduction

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{% hint style="info" %} There are no particular prerequisites for this course. You just need a passion to learn programming. If you are a beginner, don’t worry! {% endhint %}

Module 1: Structure

This module contains five chapters:

1. Introduction explains the hurdles faced by programmers and the different approaches used by the authors.
2. Origins of the OS explains the importance of operating systems and what electromechanical, relay, and electrical computers are.
3. Operating Systems explains the working of OSs, features of modern OSs, and the graphical user interface (GUI).
4. Application teaches us about the units of information and levels of computer memory. It explains machine code, source code, and how the compiler and interpreter works.
5. Bash Shell explains the development tools needed for using the Bash language, modes of interpreters, and CLI.

Module 2: Structure

This module contains thirteen chapters:

1. File System explains directory structures, different commands, and logic expressions.
2. Command Information explains how to fetch details.
3. Bash Extra Features explains Unix design, GNU utilities, I/O redirection, and many other features of Bash.
4. Script Features explains why we need scripts, the parameters of the script, and how to use the script with other commands.
5. Variables and Parameters explains variables, their declaration mechanism, types of variables, and indexed array.
6. Conditional Statements provides implementation and a detailed explanation of conditional statements.
7. Arithmetic Expressions and Operations explains the one's and two's complement, different operators, and arithmetic operations.
8. Bitwise Operations explains how bitwise AND, OR, and XOR work in detail.
9. Logical Operations and Increments explains how logical operations can help us compare numbers and how increment and decrement work in Bash.
10. Loop Operators explains how loops work and where to use them.
11. Functions explains functions and how they work, the difference between functions and aliases, and the scope of functions.
12. Package Manager explains the software installation process and how to install, remove, and update packages.
13. Bash Scripts Tools explains the tools needed for Bash and how to launch a source code editor using a terminal.

Module 3: Structure

This module contains four chapters, namely:

1. Core Bash explains quoting in Bash, globbing, special characters, basic redirection, and pipes.
2. Scripting Bash explains shell scripts, tests, loops, and exit codes. It also gives details of subshells and internal field separators (IFS).
3. Bash in Practice explains the readline library, how to set up the prompt, here docs, and Bash's history feature.
4. Advanced Bash gives us the details of job controls, traps, signal, and string manipulation. It also explains the Bash flags that are useful for debugging.

Module 4: Structure

This module contains eight chapters:

1. Introduction explains a brief introduction of shell and Linux. It also introduces the command line and other commonly used Bash commands.
2. Navigation Commands explains pathnames, symbolic links, hard links, and different directory commands.
3. File Manipulation Commands explores commands to create, remove, open, move, copy, and zip a file in Bash.
4. Permission Commands explains commands that assist in setting or removing permissions.
5. Filtering and Searching Commands explains the searching, sorting, and filtering of files in Bash. It also explains REGEX, GREP, ECREP, and FGREP.
6. System & Process Commands explains processes, the difference between jobs and processes, and how to kill any process.
7. Power of Bash explains how to install and upgrade packages using the CLI, and use of Git with Bash.
8. An Overview of Commands explores a concise cheatsheet for some commands used in Linux.