sm13-1

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>

int
main(int argc, char** argv) {
    int n = strtol(argv[1], NULL, 10);
    int counter = 0;
    pid_t pid;
    do {
        ++counter;
        printf("%d", counter);
        if (counter != n) {
            putchar(' ');
        }
        else {
            putchar('\n');
        }
        fflush(stdout);
        pid = fork();
    } while (pid == 0 && counter < n);

    if (pid > 0) {
        int status;
        waitpid(pid, &status, 0);
    }
}