How to Get File Size in Ruby: Simple Syntax and Examples

In Ruby, you can get the size of a file using the File.size method by passing the file path as an argument. This method returns the file size in bytes as an integer.

Syntax

The basic syntax to get a file size in Ruby is:

• File.size(path): Returns the size of the file at path in bytes.

Here, path is a string representing the file's location on your system.

ruby

File.size("path/to/your/file.txt")

Example

This example shows how to get the size of a file named example.txt and print it in bytes.

ruby

file_path = "example.txt"
size = File.size(file_path)
puts "The size of '#{file_path}' is #{size} bytes."

Output

The size of 'example.txt' is 1234 bytes.

Common Pitfalls

Common mistakes when getting file size include:

• Using a wrong or non-existent file path, which raises an Errno::ENOENT error.
• Trying to get size of a directory instead of a file, which may raise an error or give unexpected results.
• Not handling exceptions when the file is missing or inaccessible.

Always ensure the file exists and handle errors gracefully.

ruby

begin
  size = File.size("missing_file.txt")
  puts "Size: #{size} bytes"
rescue Errno::ENOENT
  puts "File not found. Please check the path."
end

Output

File not found. Please check the path.

Quick Reference

Summary tips for getting file size in Ruby:

• Use File.size(path) to get size in bytes.
• Ensure the file path is correct and accessible.
• Handle exceptions for missing files.
• File size is returned as an integer representing bytes.

Key Takeaways

Use File.size(path) to get the file size in bytes in Ruby.

Always verify the file path exists to avoid errors.

Handle exceptions like Errno::ENOENT for missing files.

File.size returns an integer representing the size in bytes.