[open-uri ][1]is part of the standard Ruby library, and it will redefine the behavior of `open` so that you can open a url, as well as a local file.  It returns a `File` object, so you should be able to call methods like `read` and `readlines`.

    require &#39;open-uri&#39;
    file_contents = open(&#39;local-file.txt&#39;) { |f| f.read }
    web_contents  = open(&#39;http://www.stackoverflow.com&#39;) {|f| f.read }
    



  [1]: http://ruby-doc.org/stdlib/libdoc/open-uri/rdoc/index.html

Getting the subdomain from a URL sounds easy at first.

    http://www.domain.example

Scan for the first period then return whatever came after the &quot;http://&quot; ...

Then you remember

    http://super.duper.domain.example

Oh. So then you think, okay, find the last period, go back a word and get everything before! 

Then you remember

    http://super.duper.domain.co.uk

And you&#39;re back to square one. Anyone have any great ideas besides storing a list of all TLDs?

Get the subdomain from a URL

When would you call Java&#39;s `thread.run()` instead of `thread.start()`?

When would you call java&#39;s thread.run() instead of thread.start()?

I know there are libs in other languages that can take a string that contains either a path to a local file or a url and open it as a readable IO stream. 

Is there an easy way to do this in ruby?

Open an IO stream from a local file or url

<p>I know there are libs in other languages that can take a string that contains either a path to a local file or a url and open it as a readable IO stream.</p>
<p>Is there an easy way to do this in ruby?</p>


What&#39;s the best way to unit test protected and private methods in Ruby, using the standard Ruby `Test::Unit` framework?

I&#39;m sure somebody will pipe up and dogmatically assert that &quot;you should only unit test public methods; if it needs unit testing, it shouldn&#39;t be a protected or private method&quot;, but I&#39;m not really interested in debating that.  I&#39;ve got several methods that **are** protected or private for good and valid reasons, these private/protected methods are moderately complex, and the public methods in the class depend upon these protected/private methods functioning correctly, therefore I need a way to test the protected/private methods.

One more thing...  I generally put all the methods for a given class in one file, and the unit tests for that class in another file.  Ideally, I&#39;d like all the magic to implement this &quot;unit test of protected and private methods&quot; functionality into the unit test file, not the main source file, in order to keep the main source file as simple and straightforward as possible.


What&#39;s the best way to unit test protected &amp; private methods in Ruby?

I want to deal with the command line input in Ruby:

    &gt; cat input.txt | myprog.rb
    &gt; myprog.rb &lt; input.txt
    &gt; myprog.rb arg1 arg2 arg3 ...

What is the best way to do it? In particular I want to deal with blank STDIN, and I hope for an elegant solution.

    #!/usr/bin/env ruby
    
    STDIN.read.split(&quot;\n&quot;).each do |a|
       puts a
    end
    
    ARGV.each do |b|
        puts b
    end

Best practices with STDIN in Ruby?

I&#39;m trying to figure out how to parse out the text of an email from any quoted reply text that it might include.  I&#39;ve noticed that usually email clients will put an &quot;On such and such date so and so wrote&quot; or prefix the lines with an angle bracket.  Unfortunately, not everyone does this.  Does anyone have any idea on how to programmatically detect reply text?  I am using C# to write this parser.

Parse email content from quoted reply

How do you convert between a DateTime and a Time object in Ruby?

Convert to/from DateTime and Time in Ruby

I thought this code would work, but the regular expression doesn&#39;t ever match the \r\n. I have viewed the data I am reading in a hex editor and verified there really is a hex D and hex A pattern in the file.

I have also tried the regular expressions /\xD\xA/m and /\x0D\x0A/m but they also didn&#39;t match.

This is my code right now:
   

       lines2 = lines.gsub( /\r\n/m, &quot;\n&quot; )
       if ( lines == lines2 )
    	   print &quot;still the same\n&quot;
       else
    	   print &quot;made the change\n&quot;
       end

In addition to alternatives, it would be nice to know what I&#39;m doing wrong (to facilitate some learning on my part).  :)

How do I remove carriage returns with Ruby?

I&#39;ve always wondered why the C++ Standard library has instantiated basic_[io]stream and all its variants using the &lt;code&gt;char&lt;/code&gt; type instead of the &lt;code&gt;unsigned char&lt;/code&gt; type. &lt;code&gt;char&lt;/code&gt; means (depending on whether it is signed or not) you can have overflow and underflow for operations like get(), which will lead to implementation-defined value of the variables involved. Another example is when you want to output a byte, unformatted, to an ostream using its `put` function.

Any ideas?

----------
**Note**: I&#39;m still not really convinced. So if you know the definitive answer, you can still post it indeed.

Why do C++ streams use char instead of unsigned char?

If you have a `java.io.InputStream` object, how should you process that object and produce a `String`?

---

Suppose I have an `InputStream` that contains text data, and I want to convert it to a `String`, so for example I can write that to a log file.

What is the easiest way to take the `InputStream` and convert it to a `String`?

    public String convertStreamToString(InputStream is) {
        // ???
    }



How do I read / convert an InputStream into a String in Java?

I have a `StreamReader` object that I initialized with a stream, now I want to save this stream to disk (the stream may be a `.gif` or `.jpg` or `.pdf`).


Existing Code:

    StreamReader sr = new StreamReader(myOtherObject.InputStream);


1. I need to save this to disk (I have the filename).
2. In the future I may want to store this to SQL Server.


I have the encoding type also, which I will need if I store it to SQL Server, correct?



How do I save a stream to a file in C#?

With reference to the following thread:
[https://stackoverflow.com/questions/498636/java-app-unable-to-read-iso-8859-1-encoded-file-correctly][1]

What is the best way to programatically determine the correct charset encoding of an inputstream/file ?

I have tried using the following:

    File in =  new File(args[0]);
    InputStreamReader r = new InputStreamReader(new FileInputStream(in));
    System.out.println(r.getEncoding());

But on a file which I know to be encoded with ISO8859_1 the above code yields ASCII, which is not correct, and does not allow me to correctly render the content of the file back to the console.


  [1]: https://stackoverflow.com/questions/498636/java-app-unable-to-read-iso-8859-1-encoded-file-correctly

Java : How to determine the correct charset encoding of a stream

I understand that a stream is a representation of a sequence of bytes.  Each stream provides means for reading and writing bytes to its given backing store.  But what is the point of the stream?  Why isn&#39;t the backing store itself what we interact with?  

For whatever reason this concept just isn&#39;t clicking for me.  I&#39;ve read a bunch of articles, but I think I need an analogy or something.


Content Type	Original Author	Original Content on Stackoverflow
Question	csexton	View Question on Stackoverflow
Solution 1 - Ruby	Aaron Hinni	View Answer on Stackoverflow

Open an IO stream from a local file or url

Ruby Problem Overview

Ruby Solutions

Solution 1 - Ruby

When would you call java's thread.run() instead of thread.start()?

Get the subdomain from a URL

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