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`remove'--delete a file's name

     #include <stdio.h>
     int remove(char *FILENAME);
     int _remove_r(void *REENT, char *FILENAME);
Use `remove' to dissolve the association between a particular filename
(the string at FILENAME) and the file it represents.  After calling
`remove' with a particular filename, you will no longer be able to open
the file by that name.
   In this implementation, you may use `remove' on an open file without
error; existing file descriptors for the file will continue to access
the file's data until the program using them closes the file.
   The alternate function `_remove_r' is a reentrant version.  The
extra argument REENT is a pointer to a reentrancy structure.
`remove' returns `0' if it succeeds, `-1' if it fails.
ANSI C requires `remove', but only specifies that the result on failure
be nonzero.  The behavior of `remove' when you call it on an open file
may vary among implementations.
   Supporting OS subroutine required: `unlink'.