All returns a copy of strings representing the environment, in the form "key=value".

Build builds a map to a environment variable slice.

Contains checks whether the environment variable named <key> exists.

Get returns the value of the environment variable named by the <key>.

GetVar creates and returns a Var with the value of the environment variable named by the <key>.

Map returns a copy of strings representing the environment as a map.

Remove deletes one or more environment variables.

Set sets the value of the environment variable named by the <key>.