Verifies that a fileref has been assigned for the current SAS session.
| Category: | External Files |
| Windows specifics: | the fileref argument can specify a Windows environment variable |
| See: | FILEREF Function in SAS Functions and CALL Routines: Reference |
| FILENAME Function in SAS Functions and CALL Routines: Reference |
specifies the fileref to be validated. Under Windows, fileref can also be a Windows environment variable. If the FILEREF function is used in a DATA step, fileref or the environment variable that you specify must be enclosed in quotation marks. If the FILEREF function is used in macro syntax, then fileref must not be enclosed in quotation marks.