gem

gem search [pkgname] search particular package
gem install [pkgname] install particular package
gem list show insatalled packages
gem uninstall pkgname uninstall package
compiler ruby
- sudo apt install ruby
- sudo apt install ruby-dev
packages are called gems
gems are installed in GEM_PATH so set these variables in your shell export GEM_HOME=$HOME/.gem and export GEM_PATH=$HOME/.gem
how to use gems in your project
- mentioned in the Gemfile

How to install gem

gem install buldler - installs the bundler gem for current user
- location $GEM_HOME
if you do sudo gem install bundler then it will install the gem for all users
- location /usr/share/rubygems-integration

gem list - show list of installed gems
gem list --no-versions - show installed gems without there versions
gem uninstall gem-name
- remove a gem if it is install only for current user
sudo gem uninstall gem-name
- remove a gem
sudo gem uninstall -i /usr/share/rubygems-integration/all gem-name
- forcefully remove a gem
remove all installed gems:

for i in `gem list --no-versions`; do sudo gem uninstall -aIx $i; done