Gem commands

Install a gem

gem install [gem name]

Update to latest Rubygems (if any):

gem update --system

Search for a gem:

gem query --remote --name [regular expession]

Get list of outdated gems and update as necessary:

gem outdated

Clean up outdated gems:

gem clean

List installed gems by last access time:

gem stale

Current Local Gem Repository:

gem environment

or

ruby -rrubygems -e"puts Gem.path"

Discover Dependency for a Gem:

gem dependency [gem name]

Don't generate Ri and RDoc when installing gems:

gem install [gem name] --no-ri --no-rdoc

to set this as default behavior:

echo "gem: --no-ri --no-rdoc" >> ~/.gemrc