查看“Learn ruby”的源代码

=ruby_tour=
<pre>
 sudo apt-get install ruby-full 

  ruby -v
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux-gnu]
evan@myxps:~/lx/ssh/intra$ 


交互式 Ruby（IRb）

交互式 Ruby（IRb）为体验提供了一个 shell。在 IRb shell 内，您可以逐行立即查看解释结果。

这个工具会随着 Ruby 的安装自动带有，所以您不需要做其他额外的事情，IRb 即可正常工作。

只需要在命令提示符中键入 irb，一个交互式 Ruby Session 将会开始，


intra$ irb
irb(main):001:0> puts "hey evan"
hey evan
=> nil


* base 20分钟学会Ruby 

evan@myxps:~$ irb
irb(main):001:0>  3+2
=> 5
irb(main):002:0> 3*4
=> 12
irb(main):003:0> 3**2
=> 9
irb(main):004:0> Math.sqrt(9)
=> 3.0


方法 function 

rb(main):005:0> def h 
irb(main):006:1*   puts "hey ruby"
irb(main):007:0> end
=> :h
irb(main):008:0> h
hey ruby
=> nil


irb(main):009:1* def h(name)
irb(main):010:1*   puts "hello #{name}"
irb(main):011:0> end
=> :h

irb(main):012:0> h("eva")
hello eva
=> nil

irb(main):014:1* def h(name="world")
irb(main):015:1*   puts "hello #{name.capitalize}!"
irb(main):016:0> end 
=> :h

如果不输入参数，那么就会使用默认参数world。
irb(main):017:0> h "evan"
hello Evan!
=> nil
irb(main):018:0> h
hello World!
=> nil



irb(main):019:1* class Greeter
irb(main):020:2*   def initialize(name = "world")
irb(main):021:2*     @name = name 
irb(main):022:1*   end 
irb(main):023:2*   def say_hi
irb(main):024:2*     puts "HI #{@name}!"
irb(main):025:1*   end
irb(main):026:2*   def say_bye 
irb(main):027:2*     puts "bye #{@name}. come back soon."
irb(main):028:1*   end 
irb(main):029:0> end
=> :say_bye

这里有一个新的关键词class，图中定义了一个名叫Greeter的类，里面有一些方法。注意这里的name，现在是一个实例变量，它对于Greeter中的所有类都是可用的。




irb(main):013:0> g = Greeter.new("pat")
irb(main):014:0> g.say_hi
HI pat!
=> nil
irb(main):015:0> g.say_bye
bye pat. come back soon.
=> nil
irb(main):016:0> g.@name
Traceback (most recent call last):
        3: from /usr/bin/irb:23:in `<main>'
        2: from /usr/bin/irb:23:in `load'
        1: from /usr/lib/ruby/gems/2.7.0/gems/irb-1.2.3/exe/irb:11:in `<top (required)>'
SyntaxError ((irb):16: syntax error, unexpected instance variable)
g.@name
  ^~~~~


对象内部



rb(main):017:0> Greeter.instance_methods
=> [:say_hi, :say_bye, :dup, :itself, :yield_self, :then, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :frozen?, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :remove_instance_variable, :instance_of?, :kind_of?, :is_a?, :tap, :clone, :display, :hash, :class, :singleton_class, :public_send, :method, :public_method, :singleton_method, :define_singleton_method, :extend, :to_enum, :enum_for, :<=>, :===, :=~, :!~, :nil?, :eql?, :respond_to?, :freeze, :inspect, :object_id, :send, :to_s, :__send__, :!, :==, :!=, :equal?, :__id__, :instance_eval, :instance_exec]




这里有好多方法，但我们只定义了两个方法，这里是怎么回事呢？这是对象Greeter的全部方法，一个完整的列表，包含了父类定义的一些方法。如果要列出定义在Greeter中的且不包含父类的方法，那就使用参数false：

 Greeter.instance_methods(false)
=> [:say_hi, :say_bye]


irb(main):019:0> g.respond_to?("say_hi")
=> true


</pre>






=ruby and devops=
ruby rails 做的运维管理系统

 Rails 的 CMS 内容管理系统

=see also=

[https://blog.csdn.net/lijie1010/article/details/79001115  ruby连接linux操作系统shell]



https://blog.csdn.net/mmiww/article/details/1363960


https://blog.csdn.net/mmiww/article/details/1355157


https://www.runoob.com/ruby/ruby-installation-unix.html

https://www.cnblogs.com/xuliangxing/p/7132656.html

https://linuxize.com/post/how-to-install-ruby-on-debian-9/

https://flicsdb.com/how-to-install-ruby-on-rails-on-ubuntu-or-kali-linux/










[https://ruby-china.org/topics/19914  Ruby Introduction to Programming with Ruby - 给 Ruby 新手写的免费电子书 ]

[https://ruby-china.org/wiki/books Ruby & Rails 书籍推荐]

[https://ruby-china.org/wiki/ruby-mirror Ruby 源代码镜像服务]

[https://homeland.ruby-china.org/ homeland. 开源、免费、不限制商业使用的社区论坛系统]


[[category:ops]] [[category:ruby]]