How to run ruby on rails program

As with the local version, you can then register a new user or log in as the sample administrative user with the email example railstutorial. The reference app repository includes a separate branch for each chapter in the tutorial Chapters 3— To examine the code as it appears at the end of a particular chapter with some slight variations, such as occasional exercise answers , simply check out the corresponding branch using git checkout :.

A full list of branch names appears as follows preceded the number of the corresponding chapter in the book :. For example, to check out the branch for Chapter 7, you would run this at the command line:. Experience shows that comparing code with the reference app is often helpful for debugging errors and tracking down discrepancies.

For additional assistance with any issues in the tutorial, please consult the Rails Tutorial Help page. Suspected errors, typos, and bugs can be emailed to support learnenough. All such reports are gratefully received, but please double-check with the online version of the tutorial and this reference app before submitting. Skip to content. Use whichever method you feel most comfortable with.

Using the pipe characters is an important skill to master, as these characters will alter the input or output of a Ruby script. If you open new test. 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.

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