#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define MAXLINE 128
int main(void)
{
	char	buf[MAXLINE];	
	pid_t	pid;
	int		status;
	printf("%% ");	/* prompt */
	while (fgets(buf, MAXLINE, stdin) != NULL) {
		if (buf[strlen(buf) - 1] == '\n') buf[strlen(buf) - 1] = 0; 
		if ((pid = fork()) < 0) {
			printf("errore di fork "); exit(1);
		} else if (pid == 0) {		/*figlio */
			execlp(buf, buf, NULL);
			printf("non posso eseguire: %s", buf);
			exit(127);
		} else
		if ((pid = waitpid(pid, &status, 0)) < 0) /* padre */
			{printf("errore di waitpid"); exit(1);}
		printf("%% ");
	}
	exit(0);
}