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

int main(void) {
    char buf[256];
    char *args[64];

    while (1) {
        printf("%s ", getuid() ? "$" : "#");
        fflush(stdout);

        if (!fgets(buf, sizeof(buf), stdin)) break;
        buf[strcspn(buf, "\n")] = 0; 
        if (!buf[0]) continue;
        if (!strcmp(buf, "exit")) break;

        int i = 0;
        char *tok = strtok(buf, " ");
        while (tok && i < 63) args[i++] = tok, tok = strtok(NULL, " ");
        args[i] = NULL;

        if (fork() == 0) execvp(args[0], args), perror("exec"), exit(1);
        else wait(NULL);
    }
}