int close( int fh )
- prototype in io.h - closes file fh where fh is file handle from _creat(), creat(), creatnew(), creattemp(), dup(), dup2(), _open(), or open() - use fdopen() to change file handle to file stream - does not write a Ctrl-Z to a text file on closing - returns 0 if OK; else -1 & errno may be set of EBADF