如何告诉 Ruby 程序自行关闭

1 ruby console-application exit

是否有 ruby​​ 命令告诉 ruby​​ 脚本自行关闭?我想做的是:说我正在跑步ruby.rb

print "What would you like to do next?"
next=gets.chomp   
next.downcase!
if next=="close"
    #this is where i want to be able to tell the program to close itself.
end
Run Code Online (Sandbox Code Playgroud)

有没有办法做到这一点?如果有,那是什么?