specifies the fileref
assigned to the directory. In a DATA step, fileref can
be a character expression, a string enclosed in quotation marks, or
a DATA step variable whose value contains the fileref. In a macro,
fileref can be any expression.
Details
DOPEN opens a directory
and returns a directory identifier value (a number greater than 0)
that is used to identify the open directory in other SAS external
file access functions. If the directory could not be opened, DOPEN
returns 0. The directory to be opened must be identified by a fileref.