Ruby - Get a File Size

1. Introduction

Knowing the size of a file can be crucial in many applications, especially when managing storage, uploading, or downloading files. Ruby simplifies this task with the File class, which provides methods to fetch the size of a given file. In this article, we will discuss how to determine the size of a file using Ruby.

Getting the file size means retrieving the amount of storage space a file occupies on the disk. It's commonly measured in bytes, but for user-friendly output, it might be converted to larger units like kilobytes (KB), megabytes (MB), etc.

2. Program Steps

1. Load the required library/module.

2. Specify the file name/path for which the size needs to be checked.

3. Use the size method from the File class to obtain the file size in bytes.

4. Print the result.

3. Code Program

# Specify the file name/path for which the size needs to be checked
file_name = "sample.txt"
# Check if the file exists
if File.exist?(file_name)
  # Get the file size in bytes
  file_size = File.size(file_name)
  puts "The size of the file '#{file_name}' is #{file_size} bytes."
else
  puts "The file '#{file_name}' does not exist!"
end

Output:

The size of the file 'sample.txt' is 1024 bytes.
Or
The file 'sample.txt' does not exist!

Explanation:

1. file_name = "sample.txt": Here, we specify the name or path of the file for which we want to determine the size.

2. File.exist?(file_name): Before attempting to get the size, we first check if the file exists to avoid any errors.

3. File.size(file_name): The size method from the File class returns the size of the file in bytes.

4. Depending on whether the file exists or not, an appropriate message is printed out, either displaying the file's size or indicating that the file doesn't exist.


Related Ruby Examples:

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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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