Unlinks the file PATH. A null character (CHAR(0)) can be used to mark the end of the name in PATH; otherwise, trailing blanks in the file name are ignored. If the STATUS argument is supplied, it contains 0 on success or a nonzero error code upon return; see unlink(2). 
This intrinsic is provided in both subroutine and function forms; however, only one form can be used in any given program unit.
GNU extension
Subroutine, function
| CALL UNLINK(PATH [, STATUS]) | 
| STATUS = UNLINK(PATH) | 
| PATH | Shall be of default CHARACTERtype. | 
| STATUS | (Optional) Shall be of default INTEGERtype. | 
    © Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
    https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gfortran/UNLINK.html