#include <stdio.h>
#include <sys/wait.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#define MAXLINE 1024


void err_sys(char *msg) {

	fprintf(stderr, "%s\n", msg);
	exit(EXIT_FAILURE);
}

int main() {
	char buf[MAXLINE];
	int status;
	pid_t pid;
	printf("%% ");
	while (fgets(buf, MAXLINE, stdin) != NULL) {
		if (buf[strlen(buf) - 1] == '\n')
			buf[strlen(buf) - 1] = '\0';

		if ((pid = fork()) < 0)
			err_sys("hata : fork edilemedi!");
		else if (pid == 0) {
			execlp(buf, buf, (char *)0);
			err_sys("hata : calistirilamadi!");
		}
		if ((pid = waitpid(pid, &status, 0)) < 0)
			err_sys("hata : waitpid calismadi!");
		printf("%% ");
	}
	exit(0);
}