#include <u.h>#include <libc.h> voidmain(int, char *[]){	int fd;	char msg[] = "a new file\n"; 	fd = create("/tmp/afile", OWRITE, 0664);	if(fd < 0)		sysfatal("create: %r"); 	write(fd, msg, strlen(msg)); 	close(fd);	exits(nil);}