Librefs that
refer to PC files with SAS functions might return a different value
than the value returned when you use the functions with normal SAS
data sets. The PATHNAME function might return a Microsoft Excel filename
assigned for the libref. For a normal SAS libref, it returns the pathname
for the assigned libref.
Other function options
can also vary. The LIBNAME function can accept an optional
SAS data-library argument. When you use the LIBNAME
function to assign or de-assign a libref that refers to PC files data,
you omit this argument. For full details about how to use SAS functions,
see
SAS DS2 Language Reference.