I am using IRB (interactive ruby console) to learn how to program with Ruby. How do I load a file into the console if I write my programs in a text editor first?
If you only need to load one file into IRB you can invoke it with
irb -r ./your_file.rb if it is in the same directory.
This automatically requires the file and allows you to work with it immediately.
Using ruby 1.9.3 on Ubuntu 14.04, I am able to load files from the current directory into
irb with the following command line:
irb -I . -r foo.rb
foo.rb is the file I want to load from my current directory. The
-I option is necessary to add the current directory (
.) to ruby’s load path, as explained in the ruby man page. This makes it possible to
require files from the current directory, which is what the
-r option to
The key piece that wasn’t obvious for me when I had this problem is the
-I option. Once you do that, you can call
require 'foo.rb' from within
irb for any files in the current directory. And of course, you can specify any directory you want, not just
. with the
-I option. To include multiple directories on the load path, separate them with a colon (:), e.g.:
irb -I foo/:bar/:baz/
This command will add the directories
baz to ruby’s load path.
The final alternative is to use the relative or absolute path to the file when using
-r to load a file:
irb -r ./foo.rb
or from within
> require './foo.rb'
This is assuming that ruby_file.rb is in the same directory. Adjust accordingly.
- to load source without running the program — this gives access to all variables and functions:
- to run program and then drop into interactive mode — this only gives access to functions, not variables:
It depends on your ruby. Ruby 1.8 includes your current path, while ruby 1.9 does not. Evaluate
$: to determine if your path is included or not. So in ruby 1.9 you must use the entire path, which is always a safe bet.
Then you can use
load to include the file.
require does not require you to add the suffix of the file when trying to find it and will only include the file once.
require should be used instead of
load most of the time.
Check out Adding a directory to $LOAD_PATH (Ruby) if you are going to be using ruby 1.8
Type the ruby codes in the text editor
Save it with the extension .rb (for example: demo.rb).
In linux, open your terminal then change directory to the current location of that file (cd command is used to change directory).
After that,type irb and your filename(don’t forget to include your extension(.rb)).
In that image,I loaded a simple ruby file which only prints “ruby”.
Another way to load the path into irb is just type require then drag and drop the file into the terminal.?
-tested using Linux Mint.