basic beginner help needed
in [Ruby]
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From: Karl Halvorson on 24 Jul 2010 22:28 I am new to Ruby and have been looking for some basic beginner help. I have not been able to find a beginner forum anywhere, so I apologize if this is too basic a question for this group. I have installed ruby 1.9.1 on my windows 7 pc and have had success using interactive ruby (and the Windows command prompt). Where I am stuck is creating a script in notepad and then running that script. It seems a bit peculiar to me that all the beginning tutorials that I have tried just say to create these scripts, but they don't mention where they need to be saved. I also have not come across any tutorials that cover configuring the ruby file path. I believe I have written and named the scripts properly, but when I try to open them, I get the error message: NameError: undefined local variable or method 'hello' for main:Object from (irb):1 from C:/Ruby191/bin/irb:12:in '<main>' Any help would be much appreciated. -- Posted via http://www.ruby-forum.com/.
From: X Heruacles on 24 Jul 2010 23:12 please provide your script first..then we can do a little help On Sun, Jul 25, 2010 at 10:28 AM, Karl Halvorson <karl.halvorson(a)yahoo.com>wrote: > I am new to Ruby and have been looking for some basic beginner help. I > have not been able to find a beginner forum anywhere, so I apologize if > this is too basic a question for this group. I have installed ruby > 1.9.1 on my windows 7 pc and have had success using interactive ruby > (and the Windows command prompt). Where I am stuck is creating a script > in notepad and then running that script. It seems a bit peculiar to me > that all the beginning tutorials that I have tried just say to create > these scripts, but they dont mention where they need to be saved. I > also have not come across any tutorials that cover configuring the ruby > file path. I believe I have written and named the scripts properly, but > when I try to open them, I get the error message: > > NameError: undefined local variable or method hello for main:Object > from (irb):1 > from C:/Ruby191/bin/irb:12:in <main> > > Any help would be much appreciated. > -- > Posted via http://www.ruby-forum.com/. > >
From: Phani Medicharla on 25 Jul 2010 00:02 Hello Karl, Try going through these books to get started in Ruby - http://www.humblelittlerubybook.com/book/hlrb.pdf http://www.sapphiresteel.com/The-Book-Of-Ruby I have quoted these as they are readily available on the internet for free. And as pointed out by Heruacles, posting the code snippet with which you have a problem will help the forum give you better answers. After you write code in notepad (try notepad++ or any other code editor which will give you syntax highlighting, this will help you learn easily) save the file with a .rb extension anywhere on your computer (have a separate folder for this to keep your ruby files in one place). Setting the PATH environment variable to the ruby->bin folder helps you launch the ruby interpreter from the command line (from any path). If you have installed ruby in your C drive for e.g., the bin dir would be c:\ruby-1.9.1\bin Add this path to the PATH environment variable. After this, you can open command prompt, navigate to the path where you saved your ruby file and type 'ruby filename'. For e.g, if you have saved your file in a folder called 'my scripts' on D with the name 'first.rb', you must type the following in the command prompt D:\my scripts>ruby first.rb Karl Halvorson wrote: > I am new to Ruby and have been looking for some basic beginner help. I > have not been able to find a beginner forum anywhere, so I apologize if > this is too basic a question for this group. I have installed ruby > 1.9.1 on my windows 7 pc and have had success using interactive ruby > (and the Windows command prompt). Where I am stuck is creating a script > in notepad and then running that script. It seems a bit peculiar to me > that all the beginning tutorials that I ahave tried just say to create > these scripts, but they don't mention where they need to be saved. I > also have not come across any tutorials that cover configuring the ruby > file path. I believe I have written and named the scripts properly, but > when I try to open them, I get the error message: > > NameError: undefined local variable or method 'hello' for main:Object > from (irb):1 > from C:/Ruby191/bin/irb:12:in '<main>' > > Any help would be much appreciated. -- Posted via http://www.ruby-forum.com/.
From: Colin Bartlett on 25 Jul 2010 16:28 On Sun, Jul 25, 2010 at 3:28 AM, Karl Halvorson <karl.halvorson(a)yahoo.com>wrote: > I am new to Ruby and have been looking for some basic beginner help. I > have not been able to find a beginner forum anywhere, so I apologize if > this is too basic a question for this group. I have installed ruby > 1.9.1 on my windows 7 pc and have had success using interactive ruby > (and the Windows command prompt). Where I am stuck is creating a script > in notepad and then running that script. It seems a bit peculiar to me > that all the beginning tutorials that I have tried just say to create > these scripts, but they dont mention where they need to be saved. I > also have not come across any tutorials that cover configuring the ruby > file path. I believe I have written and named the scripts properly, but > when I try to open them, I get the error message: > > NameError: undefined local variable or method hello for main:Object > from (irb):1 > from C:/Ruby191/bin/irb:12:in <main> > My apologies if the following is too elementary. I don't know how other users run Ruby programs from Microsoft Windows, but I mostly use batch files. Or, to be precise, one batch file which takes various parameters to run different Ruby programs using different versions of Ruby. (There are some online utilities to help you do that, but I've temporarily forgotten what they are called!) A simple version is the following. Suppose you save your ruby program as progname.rb in C:\ruby_programs_directory\ or whatever you want to call the directory. (It doesn't have to be a directory in the root.) You can set up a Microsoft Windows batch file with the following command call "C:\ruby19\bin\ruby.exe" -v "C:\ruby_programs_directory\%1.rb" suppose we call that batch file rr.bat Then you can run the ruby program progname.rb by going into a Command Prompt window and typing. rr %1 Does that help any? (As X Heruacles said, if you post the script you have written, and also the commands you are using to try to run it, then we may eb able to give you a correction. From the error message, you are trying to run the script in IRB?)
From: Karl Halvorson on 25 Jul 2010 18:45
Thank you all for your input. After reading the comments I took the advice of reading the two on-line tutorials, so this is where I am now: I have switched to a different computer that has the Windows XP operating system, have installed Ruby 1.9.1 on it (with ruby.exe located in 'C:\Ruby191\bin'), I downloaded and installed the SciTE editor recommended by Mr. Neighborly's Humble Little Ruby Book, and have been successful in getting the SciTE editor to open scripts located in 'C:\Documents and Settings\Karl Halvorson\My Documents\Ruby\My Ruby Tutorial scripts'. The tutorials with this editor started out fine, I entered the text puts "Hello, World." Into the text editor, pressed go and got >ruby hello.rb Hello, World. >Exit code: 0 To me that looked like it worked the way it was supposed to. I then went on to the next step and typed the following into the text editor: puts "Hello, World. What is your name?" myname = gets() puts "Well, hello there " + myname + "." I was instructed to save the file again, so I did, as hello2.rb, and ran it again from the editor by pressing go. What I returned in the right pane of the editor was: >ruby hello2.rb Also, the Windows Command Prompt opened up with 'C:\Ruby191\bin\ruby.exe' at the top in the menu bar, but nothing in the black screen except for a blinking cursor (see attached image1). I tried typing in the black screen, but was unable to. The tutorial stated, “you should see a greeting, be asked for your name, and then greeted by name.” None of this happened. Any suggestions what to try next? Also, Phaneee5, could you explain, in beginner language (step-by-step) what you mean by “Setting the PATH environment variable to the ruby->bin folder”, for this is not covered in any of the biginning tutorials that I have read? The part I really don't understand is “Add this path to the PATH environment variable.” The path to ruby.exe on my computer is 'C:\Ruby191\bin', but what exactly is the 'PATH environment variable'? and how exactly do I add 'C:\Ruby191\bin' to it? Thank you all again for your help. Phani Medicharla wrote: > Hello Karl, > > Try going through these books to get started in Ruby - > http://www.humblelittlerubybook.com/book/hlrb.pdf > http://www.sapphiresteel.com/The-Book-Of-Ruby > > I have quoted these as they are readily available on the internet for > free. And as pointed out by Heruacles, posting the code snippet with > which you have a problem will help the forum give you better answers. > > After you write code in notepad (try notepad++ or any other code editor > which will give you syntax highlighting, this will help you learn > easily) save the file with a .rb extension anywhere on your computer > (have a separate folder for this to keep your ruby files in one place). > > Setting the PATH environment variable to the ruby->bin folder helps you > launch the ruby interpreter from the command line (from any path). If > you have installed ruby in your C drive for e.g., the bin dir would be > c:\ruby-1.9.1\bin > Add this path to the PATH environment variable. > > After this, you can open command prompt, navigate to the path where you > saved your ruby file and type 'ruby filename'. For e.g, if you have > saved your file in a folder called 'my scripts' on D with the name > 'first.rb', you must type the following in the command prompt > D:\my scripts>ruby first.rb > > Karl Halvorson wrote: >> I am new to Ruby and have been looking for some basic beginner help. I >> have not been able to find a beginner forum anywhere, so I apologize if >> this is too basic a question for this group. I have installed ruby >> 1.9.1 on my windows 7 pc and have had success using interactive ruby >> (and the Windows command prompt). Where I am stuck is creating a script >> in notepad and then running that script. It seems a bit peculiar to me >> that all the beginning tutorials that I ahave tried just say to create >> these scripts, but they don't mention where they need to be saved. I >> also have not come across any tutorials that cover configuring the ruby >> file path. I believe I have written and named the scripts properly, but >> when I try to open them, I get the error message: >> >> NameError: undefined local variable or method 'hello' for main:Object >> from (irb):1 >> from C:/Ruby191/bin/irb:12:in '<main>' >> >> Any help would be much appreciated. Attachments: http://www.ruby-forum.com/attachment/4883/Image1.jpg -- Posted via http://www.ruby-forum.com/. |