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				/*				 * substitute for BSD/SVR3 rename() system call, from				 * Janet Walz, walz@mimsy.umd.edu & Rich Salz, rsalz@pineapple.bbn.com				 */								int rename(oldname,newname)				char *oldname,*newname;				{					(void)unlink(newname);					if(link(oldname,newname))						return(-1);					return(unlink(oldname));				}