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Jq Command Basics Practice Exam

Jq Command Basics Practice Exam


About Jq Command Basics Exam

Jq is a powerful command-line tool used for parsing, filtering, and manipulating JSON data. It is essential for DevOps engineers, software developers, and system administrators who work with REST APIs, automation scripts, and JSON data processing. Instead of manually handling JSON data, Jq simplifies the process by allowing users to extract specific data, transform structures, and format JSON output efficiently. In this course, you will learn how to use Jq commands within Bash shell scripts, apply filters and options, and work with JSON objects, arrays, and functions. By the end of this course, you will have a strong command over Jq, enabling you to handle JSON data effortlessly in automation and scripting tasks.


Skills Required

  • Basic knowledge of Linux or macOS (command-line usage).
  • Familiarity with Bash scripting and shell commands.
  • Understanding of JSON structure (objects, arrays, and key-value pairs).
  • Experience using text editors like vi, Vim, or VS Code.


Knowledge Area

This course will help you master:

  • Jq command-line usage for handling JSON data.
  • Extracting, filtering, and formatting JSON responses.
  • Using Jq within Bash scripts for automation.
  • Manipulating JSON objects and arrays with Jq filters.
  • Working with JSON data in DevOps and API workflows.
  • Integrating Jq with Kubernetes and system environment variables.


Who should take This Course?

  • Bash Shell Scripting developers who want to process JSON data efficiently.
  • DevOps engineers and IT professionals working with REST APIs and automation scripts.
  • Software developers who need to handle JSON within their applications.
  • System administrators who manage data exchange between applications and services.
  • Anyone working with JSON files and requiring a structured way to extract or transform data.


Course Outline

The Jq Command Basics Exam covers the following topics - 

Domain 1 - Introduction to Jq Command and Course Overview

  • Overview of Jq as a tool for filtering JSON data.
  • Setting up prerequisites for using Jq in shell scripts.
  • Understanding basic JSON structures to work with Jq.
  • Installing Jq command, verifying its version, and accessing help documentation.
  • Introduction to public REST APIs for practice and testing Jq commands.
  • Understanding how Jq processes input and output JSON data.


Domain 2 - Exploring Jq Filters and Options

  • Identity Filter: Learning how to pass JSON data through Jq unchanged.
  • Different ways to input JSON data into Jq from files and standard input.
  • Field Filter: Extracting specific fields from JSON objects.
  • Using the Raw String Output option to retrieve unformatted text from JSON.
  • Combining field filters, commas, and raw string options to customize JSON outputs.


Domain 3 - Using Jq in Bash Shell Scripts

  • Writing Bash shell scripts that use Jq to extract and manipulate JSON data.
  • Reading usernames and passwords from REST API responses in shell scripts.
  • Automating tasks with Jq commands embedded in Bash scripts.


Domain 4 - Handling JSON Arrays with Jq

  • Understanding how JSON arrays work in Jq.
  • Extracting and filtering JSON array elements using Jq commands.
  • Using array slicing to retrieve specific JSON elements efficiently.


Domain 5 - Creating JSON Objects and Arrays with Jq

  • Constructing JSON objects and arrays from scratch using Jq.
  • Building JSON data with and without input values.
  • Creating JSON structures containing null, numbers, strings, and boolean values.
  • Formatting JSON output using indentation and compact mode options.


Domain 6 - Exploring Jq Functions and Pipes

  • Introduction to Jq functions and how they combine with filters.
  • Using functions like join, range, and map to transform JSON data.
  • Understanding the has function to check for JSON key existence.
  • Using the select function with iterators and filters.


Domain 7 - Working with Environment Variables in Jq

  • Understanding environment variables in Linux and macOS.
  • Using env object and export command to pass system variables to Jq.
  • Working with --arg option to pass custom variables into Jq.
  • Exploring string manipulation functions like tostring, ascii_upcase, and ascii_downcase.
  • Using variables with filters, functions, and conditional expressions in Jq.


Domain 8 - Conditional Statements in Jq

  • Understanding if statements in Jq.
  • Using if-else and elif (else if) conditions for JSON data processing.
  • Writing conditional expressions to filter JSON data dynamically.


Domain 9 - Jq Command Exit Status for Shell Scripting

  • Understanding Jq exit status codes and their significance in shell scripts.
  • Handling errors and checking command success or failure.


Domain 10 - Working with Strings in Jq

  • Performing string concatenation using Jq.
  • Encoding and decoding JSON string values.


Domain 11 - Arithmetic Operations on JSON Data

  • Performing basic arithmetic operations on JSON numbers.
  • Handling integer and floating-point calculations using Jq.


Domain 12 - Converting JSON Arrays to Bash Arrays

  • Extracting JSON array elements and converting them into Bash shell arrays.
  • Iterating over JSON data using Bash loops.


Domain 13 - Using Jq with Kubernetes (Kubectl Integration)

  • Fetching Kubernetes resource details using Jq with Kubectl.
  • Extracting pod, deployment, and service information from Kubernetes JSON output.

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