#include <u.h>#include <libc.h> voidmain(void){	char buf[512], *p; 	p = "???";	if(getwd(buf, sizeof buf)){		p = strrchr(buf, '/');		if(p == nil)			p = buf;		else if(p>buf || p[1]!='\0')			p++;	}	write(1, p, strlen(p));	exits(0);}