rename - Rename file

Definition	#include <stdio.h> int rename(const char *name_old, const char *name_new); rename gives the file with the name name_old the new name name_new.
Return val.	0 -1	if successful. if the file could not be renamed. If for example there is no file with the name name_old, a file is already cataloged under the name name_new or the file to be renamed has been opened by a program. In addition, errno is set to EMACRO.
Record I/O	rename can also be used unchanged on files with record I/O.