Sometimes we may want to preserve the environment variables of the original user when using sudo.

If you want to preserve all env variables, you could use the -E option. But use it with caution.

sudo -E bash -c 'echo $PATH'

A better approach is to list those env variables which u want to preserve in the sudoers config file. For example, i want to keep the HTTP_PROXY and HTTPS_PROXY.

Defaults env_keep +="HTTP_PROXY"
Defaults env_keep +="HTTPS_PROXY"

So every time you use the sudo command, the HTTP_PROXY and HTTPS_PROXY are kept.

Done =)

Reference:

• StackOverflow – How to keep Environment Variables when Using SUDO
• Super User – How to allow user to preserve environment with sudo?