Ruby is…

an object-oriented interpreted scripting language. When we say it is interpreted we mean to say that the Ruby source code is compiled by an interpreter at the point of execution (similar in this regard to JavaScript and PHP). This contrasts with compiled languages such as C or C++ where the code is pre-compiled into a binary format targeted to run on a specific brand of microprocessor.

There are advantages and disadvantages to being an interpreted language. A disadvantage is speed. Because the source code has to be interpreted at runtime this means that it runs slower than an equivalent compiled application. A secondary concern for some is the fact that anyone who uses your application will also be able to see the source code. In the world of open source this is less of a problem than it used to be, but for some proprietary applications this might prove to be unacceptable.

The primary advantage of interpreted languages is that they are portable across multiple operating system platforms and hardware architectures. A compiled application, on the other hand, will only run on the operating system and hardware for which it was compiled. For example, you can take a Ruby application and run it without modification on an Intel system running Linux, an Intel system running Windows, an Intel system running Mac OS X or even a PowerPC system running Mac OS or Linux. To do this with a C or C++ application you would need to compile the code on each of the 5 different systems and make each binary image available. With Ruby you just supply the source code.

Another advantage of being interpreted is that we can write and execute Ruby code in real-time directly in the Ruby interpreter. For those who like to try things out in real time (and not everyone does), this is an invaluable feature.

Install Ruby on pcDuino Ubuntu

METHOD 1 : ( Not current stable ruby )

$ sudo apt-get install ruby

$ ruby -v
ruby 1.9.3p484 (2013-11-22 revision 43786) [arm-linux-eabihf]

METHOD 2: Install Ruby with RVM

Ruby Version Manager (RVM)

RVM is a command-line tool which allows you to easily install, manage, and work with multiple ruby environments from interpreters to sets of gems.

Step 1 — Install RVM

Before we do anything else, we should run a quick update to make sure that all of the packages we download are up to date: sudo apt-get update

Once that’s done, we can start installing RVM, Ruby Version Manager. This is a great program that lets you use several versions of Ruby on one system; however, in this case, we will just use it to install the latest version of Ruby on the droplet.

If you do not have curl on your system, you can start by installing it:

To install RVM, open terminal and type in this command:

After it is done installing, load RVM.

check rvm version

Step 2 —Install Ruby

Once you are using RVM, installing Ruby is easy.

Current Stable Ruby Version is 2.1.2

So,

$ rvm install 2.1.2

example of ruby 2.0.0 :

Ruby is now installed. However, since we accessed it through a program that has a variety of Ruby versions, we need to tell the system to use 2.0.0 by default.

Step 3 —Install RubyGems

The next step makes sure that we have all the required components of Ruby on Rails. We can continue to use RVM to install gems; type this line into terminal.