從文字檔讀入並讀出特定字串那行

只做簡單的比對，若要變更只要更改正規式裡面的條件就好

不過應該有比較簡易的寫法吧？目前是這樣比較容易閱讀 :p

filename = 'input.txt'
output = 'output.txt'

if File.file? filename
  p 'Reading File...'
  open(filename) do |f|
    open(output, 'a') do |out|  
  p 'Writting File...'
      f.to_a.each do |x|
        if x =~ /String!/
          out.puts x
        end
      end

    end # end of output   
  end # end of filename

else
  p "File Open Error!"
end

http://pastie.org/238588

Hello World!

• Ruby
  

  
  puts "Hello World!"
  



• jQuery
  

  $(document).ready(function(){$("p").append("Hello World!")}); 
  



• JavaScript
  

  
  document.write("Hello World!")
  

  
  


• C#
  

  
  using System;
  namespace HelloWorld {
      class Hello{
          static void Main(){
              System.Console.WriteLine("Hello World!");
          }
      }
  }
  



• Java
  

  
  class HelloWorld{ 
      public static void main(String args[]){
          System.out.println("Hello World!");
      }
  }
  



• Bash
  

  
  #!/bin/bash
  STR="Hello World!"
  echo $STR
  



• HTML
  

  
  <html><head><title>Hello World</title></head><body><p>Hello World!</p></body></html> 



• C++
  

  
  #include <iostream.h>
  main(){
      cout << "Hello World!";
      return 0;
  }
  



• C
  

  
  #include <stdio.h>
  main(){
      for(;;){
          printf ("Hello World!\n");
      }
  }