Your question: What does gem list do?

What do I do with a gem file?

Your gemfile is a list of all gems that you want to include in the project. It is used with bundler (also a gem) to install, update, remove and otherwise manage your used gems. These gems belong to development environment and the test environment since they are for testing the application.

What is RubyGems How does it work?

RubyGems is a package manager for the Ruby programming language that provides a standard format for distributing Ruby programs and libraries (in a self-contained format called a “gem”), a tool designed to easily manage the installation of gems, and a server for distributing them.

What does gem pristine do?

Instead, try gem pristine :

gem pristine takes a gem, and resets it to the version you originally downloaded. It’s like uninstalling and reinstalling the gem. (This is also helpful if you decided to edit a gem while debugging, and forgot to change it back.)

What is gem command in Linux?

The gem command is the way you interact with the RubyGems package system. User Tasks. Now that you have the gem command, you can begin installing gem packages. You need to be root to install or modify gems, but any user can query the system to find out what is installed.

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What is gem file?

Sep 13, 2018 · 2 min read. A Gemfile is a file we create which is used for describing gem dependencies for Ruby programs. A gem is a collection of Ruby code that we can extract into a “collection” which we can call later. It lets you specify which gems you want to use, and which versions of these gems to use.

How do I run a gem file?

run the command bundle install in your shell, once you have your Gemfile created. This command will look your Gemfile and install the relevant Gems on the indicated versions. The Gemfiles are installed because in your Gemfile you are pointing out the source where the gems can be downloaded from.

What is Ruby on Rails gem?

Ruby on Rails is a popular web development technology. … Gems in Rails are libraries that allow any Ruby on Rails developer to add functionalities without writing code. You can also call Ruby on Rails gems as plugins for adding features. A Ruby gem enables adding features without creating the code again and again.

How does gem install work?

gem install , in its simplest form, does something kind of like this. It grabs the gem and puts its files into a special directory on your system. You can see where gem install will install your gems if you run gem environment (look for the INSTALLATION DIRECTORY: line):

What is ruby used for?

Ruby is most used for building web applications. However, it is a general-purpose language similar to Python, so it has many other applications like data analysis, prototyping, and proof of concepts. Probably the most obvious implementation of Ruby is Rails web, the development framework built with Ruby.

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What does bundle exec do?

bundle exec makes a number of changes to the shell environment, then executes the command you specify in full. It also modifies Rubygems: disallow loading additional gems not in the bundle. modify the gem method to be a no-op if a gem matching the requirements is in the bundle, and to raise a Gem::LoadError if it’s not.

Where are my ruby gems installed?

When you use the –user-install option, RubyGems will install the gems to a directory inside your home directory, something like ~/. gem/ruby/1.9. 1 . The commands provided by the gems you installed will end up in ~/.

Where does bundler install gems?

The location to install the gems in the bundle to. This defaults to Rubygems’ gem home, which is also the default location where gem install installs gems. This means that, by default, gems installed without a –path setting will show up in gem list .

Is gem install global?

will install your gem globally, i.e. it will be available to all user’s contexts.

How do I check my gems?

Since your goal is to verify a gem is installed with the correct version, use gem list . You can limit to the specific gem by using gem list data_mapper . To verify that it’s installed and working, you’ll have to try to require the gem and then use it in your code.

How do I check my gem source?

Using gem search -r , you can search RubyGems’ repository. For instance, gem search -r rails will return a list of Rails-related gems. With the –local ( -l ) option, you would perform a local search through your installed gems. To install a gem, use gem install [gem] .

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