getenv:

Synopsis:	Return value for environment name.

Syntax:		getenv ( NAME )

Description:

	Getenv searches the current environment for a variable with
	name NAME. The value of the environment variable is returned
	as a string.

	Exactly how getenv behaves is depends upon the underlying
	operating system implementation. On UNIX system getenv will
	return a NULL string if the environment variable does not
	exist. 

See Also: putenv
