Run ruby file xcode

Knowing how to save output to a. It allows you to save program output for careful examination or to be used as input to another script at a later time.

It's helpful to think of these two characters as funnels; you're funneling output to files and input from files. Then there's the pipe character,. This character will funnel the output from one script to the input of another script. It's the equivalent of funneling the output of a script to a file, then funneling the input of a second script from that file.

It just shortens the process. The character is useful in creating "filter" type programs, where one script generates unformatted output and another script formats the output to the desired format. Then the second script could be changed or replaced entirely without having to modify the first script at all.

One of the great things about Ruby is that it's test-driven. The interactive Ruby prompt provides an interface to the Ruby language for instant experimentation.

This comes in handy while learning Ruby and experimenting with things like regular expressions. Ruby statements can be run and the output and return values can be examined immediately. If you make a mistake, you can go back and edit your previous Ruby statements to correct those mistakes.

To start the IRB prompt, open your command-line and run the irb command. You'll be presented with the following prompt:. Type the "hello world" statement we've been using into the prompt and hit Enter. You'll see any output the statement generated as well as the return value of the statement before being returned to the prompt.

In this case, the statement output "Hello world! To run this command again, simply press the up key on your keyboard to get to the statement you previously ran and press the Enter key. If you want to edit the statement before running it again, press the left and right arrow keys to move the cursor to the correct place in the statement. Make your edits and press Enter to run the new command. Pressing up or down additional times will allow you to examine more of statements you've run.

The interactive Ruby tool should be used throughout learning Ruby. When you learn about a new feature or just want to try something, start up the interactive Ruby prompt and try it. See what the statement returns, pass different parameters to it and just do some general experimenting.

So, from your working directory, this would be:. Notice the only difference between this approach and 2 was that we don't need the ruby command in front.

Okay, so there are four different ways in which you can write and run scripts, so which one is best? The answer, of course, is it depends. It depends mostly on what you're doing, how variable it is, and how frequently you're doing it.

I follow this general approach:. Always googling and forgetting how to pass arguments to rake tasks? Here's a up list of the various methods. ActsAsTaggableOn is a great gem for working with tags in your application, but it can be a PITA when you want to be able to search for tags. The difference between Ruby's class and class instance variables, and how you can use them to abstract functionality from inherited classes.

The Script Before we get into the methods, let's look quickly at the script. This is the script: puts 'Hello World' Yeah, that's it. Type exit to get out of the session. So let's do that. Now, before you are able to run the command, you'll want to make it executable.

Which is best? The Xcode is the primary development tool of Apple for developing applications for the Apple products. In the related links section you will find more useful information of how to use more advanced features of your iOS App, such as installing it on your iPhone or iPad device, push notifications to your App users and publish your App in the Apple App Store.

Here are the stages in order to compile and run your iOS App under the simulator of the Xcode of your Mac.