class Kernel

Question 1

exit(p1 = v1)

Answer 1

Initiates the termination of the Ruby script by raising the SystemExit exception. This exception may be caught. The optional parameter is used to return a status code to the invoking environment. true and FALSE of status means success and failure respectively. The interpretation of other integer values are system dependent.

begin
  exit
  puts "never get here"
rescue SystemExit
  puts "rescued a SystemExit exception"
end
puts "after begin block"

rescued a SystemExit exception
after begin block

Question 2

at_exit()

Answer 2

Converts block to a Proc object (and therefore binds it at the point of call) and registers it for execution when the program exits. If multiple handlers are registered, they are executed in reverse order of registration.

def do_at_exit(str1)
  at_exit { print str1 }
end
at_exit { puts "cruel world" }
do_at_exit("goodbye ")
exit

Question 3

URI(uri)

Public Class Method

Answer 3

Returns uri converted to a URI object.

Question 4

open(path [, mode [, perm]] [, opt]) → io or nil
open(path [, mode [, perm]] [, opt]) {|io| block } → obj
(Public Class Method)

Answer 4

Creates an IO object connected to the given stream, file, or subprocess.

Question 5

pp(*objs)

Public Class Method

Answer 5

prints arguments in pretty form.

pp returns argument(s).

Question 6

open_uri_original_open(*args)

Private Class Method

Answer 6

Alias for: open