Ruby - Print Environment Variables

1. Introduction

Environment variables are essential pieces of information stored on your computer that describe the system environment. They can influence the behavior of programs and can store settings like paths, configurations, and more. In Ruby, it's simple to fetch and display these environment variables. In this post, we'll see how to do just that.

2. Program Steps

1. Open your Ruby programming environment or any text editor.

2. Utilize Ruby's built-in ENV object to access environment variables.

3. Loop through the ENV object to print each key-value pair representing each environment variable and its value.

3. Code Program

# Loop through and print each environment variable
ENV.each do |key, value|
  puts "#{key}: #{value}"
end

Output:

PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOME: /home/username
... (and so on, depending on the environment variables set on your system)

4. Step By Step Explanation

1. ENV: This is a built-in Ruby object that provides a hash-like interface to environment variables.

2. ENV.each: We use the each method, which is a common method available for hash-like objects in Ruby, to loop through each key-value pair in the ENV object.

3. puts "#{key}: #{value}": Inside our loop, we print out the environment variable name (key) and its corresponding value.

Accessing environment variables is crucial in many scenarios, especially when working with configurations, paths, or sensitive data in your Ruby applications.


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Ruby Tutorials

Ruby Hash Tutorial Ruby String Tutorial Ruby Array Tutorial Ruby - Match a Pattern in a String Ruby - map Function Example Ruby - reduce Function Example Ruby - select Function Example Ruby - Date and Time Example Ruby - Create and Execute a Basic Thread Ruby - Main Thread and Sub-threads Ruby - Pause Execution of Thread Using sleep Ruby - Terminate a Thread Using Thread.kill Ruby - Check Status of a Thread Using alive? Ruby - Thread Priority Example Ruby - Use Thread.pass for Thread Scheduling Ruby - Thread Local Variables Ruby Convert String to Hash Ruby Convert String to JSON Ruby Convert String to Integer Ruby Convert String to Array Ruby Convert String to Date Ruby Convert String to CamelCase Ruby Convert String to Boolean Ruby Convert String to Float Ruby Convert String to DateTime Ruby Convert Number to String Ruby Convert Number to Binary Ruby Convert Number to Boolean Ruby Convert List to Set Ruby Convert List to String Ruby Convert List to Hash Ruby Convert List to Map Ruby Convert Array to List Ruby Convert Array to Hash Ruby Convert Array to Hash With Index as Key Ruby Convert Array to Set Ruby Convert Array to String Comma Separated Ruby Convert Array of Strings to Integers Ruby Convert Array to JSON Ruby Convert Array of Hashes to JSON Ruby Convert Hash to JSON Ruby Convert Hash to String Ruby Convert Hash to Array Convert Hash Keys to Strings Ruby Convert Date to DateTime Ruby Convert Date to Epoch Ruby Convert Date to TimeStamp Ruby Convert Date to Milliseconds

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