File: tkhello.rb

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# frozen_string_literal: false
require "tk"

TkButton.new(nil,
             :text => 'hello',
             :command => proc{print "hello\n"}).pack(:fill=>'x')
TkButton.new(nil,
             :text => 'quit',
             :command => proc{exit}).pack(:fill=>'x')

Tk.mainloop