Maintaining Environment Variables with sudo Revision as of Monday, 21 December 2015 at 02:30 UTC

Especially useful if you need to use proxies. E.g., this will fail since
the sudo user doesn’t know about the https_proxy variable.

 sudo curl -L https://get.rvm.io | bash -s stable --ruby

The solution is to visudo, find this

 Defaults env_reset 

and add this for each variable you want available.

 Defaults env_keep += "variable1 variable2"

In the case of proxies,

 Defaults env_keep += "http_proxy https_proxy ftp_proxy"