bundle:tldr:3a73a

The command "bundle update --group ${development}" is used in the context of Ruby on Rails development and is executed in the command line.

Here's a breakdown of what it does:

1. "bundle update" is a command used by Bundler, a dependency management tool in Ruby, to update the installed gems in your Rails project. It analyzes the Gemfile.lock and fetches the latest versions of the gems specified in the Gemfile.

2. The "--group" option allows you to specify a specific group of gems to update. Groups in Bundler are used to organize gems based on their purpose or environment. For example, "development" is a common group that includes gems used in the development environment, such as debugging tools, code analyzers, or testing frameworks.

3. "${development}" is a placeholder for a variable that represents the specific group to update. In this case, it assumes that the variable is named "development" and should contain the group name. This allows you to pass the group dynamically without hard-coding it in the command.

So, when you run the command "bundle update --group ${development}", Bundler will update the gems specified in the Gemfile within the "development" group. The group is typically associated with gems used during development, ensuring you have the latest versions installed for testing and debugging purposes.