When you run a Ruby file from the command line, the code gets executed by whats called an.If you have Ruby installed on your computer and you’d like to get a little bit of practice coding, this article will run you through creating your very first Command Line Interface in Ruby. The -t option means 'open the file with the default application for editing text files, as determined via LaunchServices'.That leaves Mac users with one choice: install with Homebrew. The -e option means 'open the file argument with the TextEdit application'. Open -a TextEdit file.txt. The -a option means 'open the file argument with the named application'. Here are some possible answers, all using the open command-line utility.To make this accessible without being unreasonably long it assumes that:Interactive Ruby Tools - Improved irb and rails console with a lot of easy and. Dixius99.This article is not for everyone! It’s for people with some experience of coding. I understand that this is better to do everything from emacs, and opening files is one of things that should be done that way, but sometimes the file you need is already in the filemanager or terminal, and its way faster to open it in existing Emacs instance.It’s one of the reasons that text editors like vim and emacs continue to be popular amongst developers.There are lots of cool things you can build a command line app to do - whether you want to be able to check the weather, back up your files to a remote location or write scripts to automate “busywork” like pulling information out of an excel file. A CLI is simply a way of “talking” to a piece of software by passing it text commands.The terminal is the place where you can tell your computer exactly what you want it to do without having to test your hand-eye coordination with a mouse a bunch of times just to find the menu option you’re interested in! In fact, the more time you spend programming, the more likely you are to start to use text based interfaces for interacting with computers. The terminal is how you connect to programs that expose a Command Line Interface (CLI). The Power of the Command Line Interface (CLI)Once you start on the path to becoming a professional software developer, you’re going to learn to love the terminal window.
Open Es In Terminal For Ruby File Code Gets ExecutedYou should go to a directory within your home directory on your computer so you have permission to write and edit files. Then I’m going to start by going to the directory I keep all of my code in. It’s not required, but if you ever want to become a professional software developer, it’s a skill you should practice.Start by opening a terminal window on your machine. In this article, I’m going to keep track of my changes using Git for version control. Building a CLI in RubyAssuming you have Ruby installed, creating a command line interface is pretty straightforward. In a future article we’ll add some more functionality to show just how powerful a CLI can be. ![]() Firstly, we need to make the file executable, so type: 1And then try running the file (note the preceding `./` - you’ll need that to make this work) 1There are two lines of code. And then let’s save our changes in Git 1OK, let’s see what we’ve got. 1> #!/usr/bin/env ruby > puts 'hello world'Now, let’s save the file to disk - typically hitting the S key while holding down the command key on a mac or the control key on a PC. Download for fortnite macIt allows us to parse any options provided from the command line and can even create help docs for your script.Let’s start by putting the following into the cli.rb so it looks like: 1#ruby #!/usr/bin/env ruby require 'optparse' options = Great! Let’s remember to save our changes to version control: 1And there we go! We’ve now created a super simple CLI program in Ruby. Let’s personalize the greeting to make it “hello Sarah” - replacing Sarah with whatever name we pass into the script.Let’s use the OptionParser class which is built right into Ruby. Now let’s see if we can take an input from the CLI as well. We could change that to something like `#!/usr/bin/env python` if we wanted to write a Python script - but let’s save that for a different tutorial!OK, so we have a script that we can call that outputs to the command line. And the first line is a “ shebang” which tells the computer what interpreter to use to process the rest of the file - in this case, Ruby.
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