Example uses of HexString, extracted from README.md

hex_string_example_uses.rb

# Load HexString and automatically extend String:
require 'hex_string'

# Convert data to human-readable hex tuples:
>> "hello".to_hex_string
=> "68 65 6c 6c 6f"

# Compact a hex string into its data equivalent:
>> "77 6f 72 6c 64".to_byte_string
=> "world"

# (#to_byte_string is space and case-insensitive:)
>> "776F726C64".to_byte_string
=> "world"

# Peek at the first 4 bytes of an executable on OS X:
>> File.read("/bin/ls")[0..3].to_hex_string
=> "ca fe ba be"