There is annoying line wrap issue present after installing iPython on OS X Mavericks for the first time. The issue has to do with readline being missing. To fix the problem uninstall iPython, install readline and then install iPython. pip uninstall ip...

Rails will infer the controller you want to test from the class name of the test case. For example... class PeopleControllerTest < ActionController::TestCase end will test the app/controllers/people_controller.rb. To change this is trivial. Us...

In your project's root directory add a .ruby-version file and add the ruby version to the file ruby-2.0.0-p247 Next source RVM in the .powrc file, also in your project's root directory. source "$rvm_path/scripts/rvm" rvm use `cat .ruby-versio...

Here is the snippet f path/to/directory 'search string' | open_in_mate This snippet (technically 2 snippets) will recursively scan the contents of files in a directory and then open all the files it finds in Textmate. It's useful on large projec...

You need to read from STDIN rather than parse command line arguments. while $stdin.gets puts $_ end

# time_ago_in_words(Time.now, 1.day.ago) # => 1 day # time_ago_in_words(Time.now, 1.hour.ago) # => 1 hour def time_ago_in_words(t1, t2) s = t1.to_i - t2.to_i # distance between t1 and t2 in seconds resolution = if s > 29030400 # seco...

Foreman is a process management gem for ruby applications. It is used in combination with a Procfile for configuration instructions. A typical Procfile looks something like this [name] : [script to execute] Example Rack application Procfile ...

Sinatra doesn't have a method for rendering partials. It defers to the template language of your choice. For instance, if you're using ERB, it's as simple as erb :'path/to/partial' Rails has a nice convention of using an underscore to mark file...

Use the split command. split -l 1000 name-of-file output/directory You can set the number of lines (the "-l" flag) to split on and also the location of where the split files should be saved. Note, the output directory must already exists....

Let's create a table that will hold some dummy data. > create table fruits (id serial primary key, name varchar, color varchar); > insert into fruits (name, color) values ('apple', 'red'); > insert into fruits (name, color) values ('ap...