Not sure about the rubygem20-aws-sdk package on aws

gistfile1.txt

[ec2-user@ip-172-31-44-96 modules]$ gem list

*** LOCAL GEMS ***

bigdecimal (1.2.0)
jmespath (1.1.3)
json (1.8.2)
nokogiri (1.6.1)
psych (2.0.0)
rdoc (4.1.0)
[ec2-user@ip-172-31-44-96 modules]$ sudo yum install rubygem20-aws-sdk
Loaded plugins: priorities, update-motd, upgrade-helper
Resolving Dependencies
--> Running transaction check
---> Package rubygem20-aws-sdk.noarch 0:1.51.0-1.0.amzn1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================
 Package                  Arch          Version                  Repository        Size
========================================================================================
Installing:
 rubygem20-aws-sdk        noarch        1.51.0-1.0.amzn1         amzn-main        1.4 M

Transaction Summary
========================================================================================
Install  1 Package

Total download size: 1.4 M
Installed size: 5.2 M
Is this ok [y/d/N]: y
Downloading packages:
rubygem20-aws-sdk-1.51.0-1.0.amzn1.noarch.rpm                    | 1.4 MB     00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : rubygem20-aws-sdk-1.51.0-1.0.amzn1.noarch                            1/1 
  Verifying  : rubygem20-aws-sdk-1.51.0-1.0.amzn1.noarch                            1/1 

Installed:
  rubygem20-aws-sdk.noarch 0:1.51.0-1.0.amzn1                                           

Complete!
[ec2-user@ip-172-31-44-96 modules]$ gem list

*** LOCAL GEMS ***

aws-sdk (1.51.0)
bigdecimal (1.2.0)
jmespath (1.1.3)
json (1.8.2)
nokogiri (1.6.1)
psych (2.0.0)
rdoc (4.1.0)
[ec2-user@ip-172-31-44-96 modules]$ ruby -e 'require 'aws-sdk'
> '
-e:1:in `<main>': undefined local variable or method `aws' for main:Object (NameError)
[ec2-user@ip-172-31-44-96 modules]$ ruby -e "require 'aws-sdk'"
[ec2-user@ip-172-31-44-96 modules]$ ruby -e "require 'aws-sdk'; s3 = Aws::S3::Client.new(:region => 'us-east-1')"
-e:1:in `<main>': uninitialized constant Aws (NameError)
[ec2-user@ip-172-31-44-96 modules]$ 


[ec2-user@ip-172-31-44-96 modules]$ sudo gem install aws-sdk
Fetching: aws-sdk-core-2.1.23.gem (100%)
Successfully installed aws-sdk-core-2.1.23
Fetching: aws-sdk-resources-2.1.23.gem (100%)
Successfully installed aws-sdk-resources-2.1.23
Fetching: aws-sdk-2.1.23.gem (100%)
Successfully installed aws-sdk-2.1.23
Parsing documentation for aws-sdk-core-2.1.23
Installing ri documentation for aws-sdk-core-2.1.23
Parsing documentation for aws-sdk-resources-2.1.23
Installing ri documentation for aws-sdk-resources-2.1.23
Parsing documentation for aws-sdk-2.1.23
Installing ri documentation for aws-sdk-2.1.23
Done installing documentation for aws-sdk-core, aws-sdk-resources, aws-sdk after 5 seconds
3 gems installed
[ec2-user@ip-172-31-44-96 modules]$ gem list

*** LOCAL GEMS ***

aws-sdk (2.1.23, 1.51.0)
aws-sdk-core (2.1.23)
aws-sdk-resources (2.1.23)
bigdecimal (1.2.0)
jmespath (1.1.3)
json (1.8.2)
nokogiri (1.6.1)
psych (2.0.0)
rdoc (4.1.0)
[ec2-user@ip-172-31-44-96 modules]$ ruby -e "require 'aws-sdk'; s3 = Aws::S3::Client.new(:region => 'us-east-1')"
[ec2-user@ip-172-31-44-96 modules]$