程式印象: Ruby

顯示具有 Ruby 標籤的文章。顯示所有文章

2012年12月4日星期二

Ruby Command Line Scripting

Why Ruby?

It’s syntax is easy to learn and you end up with easy to read code.

The Solution 
 how to look through a directory for files
Here is the code I used to rename any files with the name ._something (like ._Apple) into something.icns:

puts "hello world\n"

  Dir["._*"].each do |file|
    unless file =~ /._(\w|\s)+.rtf/ || file =~ /._(\w|\s)+.webloc/
      puts "#{file} renamed"
      newfile = String.new(file.delete "._")
      newfile << ".icns"
      File.rename(file, newfile)
      puts "Renamed to #{file}\n"
    end
  end

  puts "\n\n"

unless file =~ /._(\w|\s)+.rtf/ || file =~ /._(\w|\s)+.webloc/
This line says if a string matches ._(one or more letters or spaces).rtf or ._(one or more letters or spaces).webloc it will ignore it. The unless means unless this is true do the following, pretty straightforward. The + means one or more of the things inside the parenthesis. The =~ is used to match something to a regular expression. And finally the || means ‘or’ much like in many other computer language.

In order to run this script, I saved it as rename.rb file and then just typed ruby rename.rb on the command line in the directory I wanted it to perform the task.

ruby regexp tutorial

遠山藍

在文字的世界裡尋找心靈的共鳴，遠山藍以溫柔的筆觸分享書籍的力量與生活的智慧。無論是細膩的書評、深刻的人生感悟，還是技術與創新的新奇發現，每篇文章都是一次內心的療癒旅程。希望透過閱讀，帶領讀者在忙碌的生活中找到一片寧靜與啟發。讓我們一起，在書香中遇見更好的自己！

rename.rb

puts "hello world\n"

  Dir["._*"].each do |file|
    unless file =~ /._(\w|\s)+.rtf/ || file =~ /._(\w|\s)+.webloc/
      puts "#{file} renamed"
      newfile = String.new(file.delete "._")
      newfile << ".icns"
      File.rename(file, newfile)
      puts "Renamed to #{file}\n"
    end
  end

  puts "\n\n"

遠山藍

hello.rb

puts 'hello world'

遠山藍

ruby安裝事宜

============
首先到http://www.ruby-lang.org/en/20020102.html找到Downloadable Items的Install Ruby under Windows連結，點進去找到Download連結，之後下載ruby184-20.exe安裝。
到http://wxruby.rubyforge.org/wiki/wiki.pl下載wxruby-0.6.0-mswin.exe安裝，安裝時會彈出個訊息"Could not find Ruby installation. You must manually copy \wxruby.so' to (ruby-dir)\lib\ruby\site_ruby\1.8\i386-msvcrt\."，不理訊息繼續安裝，完成後照訊息做一次。

SCRIPT
======
original link: http://civ2boss.weblogs.us/archives/2006/03/26/ruby-command-line-scripting/
ref: Ruby Command Line Scripting  In My Life.htm
file: rename.rb
function: rename file
state:
D:\Python24>ruby rename.rb
rename.rb:6: warning: parenthesize argument(s) for future version
hello world

D:\Python24>ruby -e rename.rb
-e:1: undefined local variable or method `rename' for main:Object (NameError)

SAMPLE
======
original link: http://www.rubyist.net/~slagell/ruby/getstarted.html
% echo "puts 'hello world'" > hello.rb
edit hello.rb
~puts 'hello world'
% ruby hello.rb
hello world

% ruby -i.bak -pe 'sub "foo", "bar"' *.[ch]
#all C source and header files in the current working directory, backing up the original files with ".bak" appended:

遠山藍

2010年12月31日星期五

使用指令行參數

使用方法：ruby MyScript.rb InputFile.csv SortedOutputFile.csv
執行後：產生test.rb檔案

MyScript.rb程式碼


#除非取得兩個參數，否則結束程式
unless ARGV.length == 2
  puts "Dude, not the right number of arguments."
  puts "Usage: ruby MyScript.rb InputFile.csv SortedOutputFile.csv\n"
  exit
end

#輸入的檔案當作第一個參數
input_file = ARGV[0]
print input_file #print aa
#輸出的檔案當作第二個參數
output_file = ARGV[1]

#寫入檔案test.rb
File.open('test.rb', 'w') do |f2|
   # use "\n" for two lines of text
   f2.puts input_file+"\n"
   f2.puts output_file+"\n"
   f2.puts "Created by Satish\nThank God!"
end
#讀取檔案test.rb
File.open('test.rb', 'r') do |f1|
  while line = f1.gets
    puts line
  end
end

遠山藍

訂閱：文章 (Atom)

2012年12月4日 星期二