unlink - remove satellite file
removes the file named by
freeing the space in the file system occupied by that file.
The named file is removed unless one or more of the following are
The path name points to a file on the host. [EACCES]
The path name specifies a directory or file that does not
The file is write protected. [EACCES]
On successful completion, 0 is returned. Otherwise, a value of -1 is
is set to indicate the error.