#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
char cmd[256];
int main()
{
	int rbytes=read(0,cmd,sizeof(cmd));
	cmd[rbytes-1]='\0';
	execlp(cmd,cmd,NULL);
	printf("errno: %d\n", errno);
}