Command: getenv
  
Syntax: 
  x = getenv(s)
  
Description: 
  Return the value of a DOS environment variable. If the variable
  is undefined return -1.
  
Example: 
     e = getenv("EUDIR")
      -- e will be "C:\EUPHORIA" -- or perhaps D:, E: etc.
 
Comments: 
  Because either a sequence or an atom (-1) might be returned, you 
  should probably assign the result to a variable declared as 
  object.
  
See Also: 
  command_line
  
