Warning: The following versions of Ruby have reached End of Life and are no longer supported
Raised by some IO operations when reaching the end of file. Many IO methods exist in two forms,
one that returns nil when the end of file is reached, the other raises EOFError.
EOFError is a subclass of IOError.
file = File.open("/etc/hosts")
file.gets #=> nil
file.readline #=> EOFError: end of file reached