Returns the string value assigned to a system environment variable
A string specifying the name of the variable to be read. Environment variable names must be spelled and cased exactly as they are stored in the system registry.
getenv returns nil.A string representing the value assigned to the specified system variable. If the variable does not exist,
ACAD is set to /acad/support and there is no variable named NOSUCH.Assume the system environment variable
Command: (getenv "ACAD")
Command: (getenv "NOSUCH")
MaxArray environment variable is set to 10000:Assume that the
Command: (getenv "MaxArray")