cheat sheets.

--- gem version 3	Tue Feb 20 10:36:01 +0000 2007
+++ gem version 10	Thu Jul 03 08:41:09 +0000 2008
@@ -1,16 +1,44 @@
 Install a gem
 
-  gem install [gem name] --include-dependencies
+  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 Get list of outdated gems and update as necessary:
 
   gem outdated
 
 Clean up outdated gems: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