Verifies the existence of an external file by its fileref.
| Category: | External Files |
| See: | FEXIST Function in SAS Functions and CALL Routines: Reference |
| FILENAME Function in SAS Functions and CALL Routines: Reference |
specifies the fileref that is assigned to an external file. Under Windows, fileref can also be an environment variable. If the function is used in a DATA step, the fileref or the environment variable that you specify must be enclosed in quotation marks. If the function is used in a macro, then the fileref must not be enclosed in quotation marks.