This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

close 

        # IO.close

(from ruby core)
---
    ios.close   -> nil

---

Closes *ios* and flushes any pending writes to the operating system. The
stream is unavailable for any further data operations; an IOError is
raised if such an attempt is made. I/O streams are automatically closed
when they are claimed by the garbage collector.

If *ios* is opened by IO.popen, #close sets `$?`.

Calling this method on closed IO object is just ignored since Ruby 2.3.

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.