如何以编程方式获取Ruby的标准库(或系统gem)路径？

require 'rbconfig'

# 获取标准库路径
standard_library_path = RbConfig::CONFIG['libdir']

# 获取gem路径
gem_paths = Gem.path

puts "Standard Library Path: #{standard_library_path}"
puts "Gem Paths: #{gem_paths.join(', ')}"

require 'gem'

# 获取所有gem的路径
gem_paths = Gem.path

puts "Gem Paths: #{gem_paths.join(', ')}"

# 获取GEM_PATH环境变量的值
gem_paths_from_env = ENV['GEM_PATH'].split(File::PATH_SEPARATOR)

puts "Gem Paths from GEM_PATH: #{gem_paths_from_env.join(', ')}"