Return the value of environment variable {name}. The {name} argument is a string, without a leading '$'. Example: myHome = getenv('HOME') When the variable does not exist |v:null| is returned. That is different from a variable set to an empty string, although some systems interpret the empty value as the variable being deleted. See also |expr-env|. Can also be used as a |method|: GetVarname()->getenv()