#include<stdio.h>
#include<stdlib.h>
#include<sys/wait.h>
#include<unistd.h>
#include<string.h>
char **parse(char *line) {
  char **args= malloc(64 * sizeof(char *));
  int i = 0;
  char *token = strtok(line, " \t\n");
  while(token !=NULL) {
    args[i] = token;
    i++;
    token = strtok(NULL, " \t\n");
  }
  args[i] = NULL;
  return args;
}
int main() {
	char line[1024];
	while(1) {
		printf("$");
		fflush(stdout);
		char *result = fgets(line, sizeof(line), stdin);
		if(result == NULL) return 0;
		char **parsed = parse(line);
		if(parsed[0] == NULL) { free(parsed); continue; }
		pid_t pid = fork();
		if(pid == 0) {
		  if(execvp(parsed[0], parsed) == -1 ) {
		    perror("tinysh");
		    exit(1);
		  }
		} else if(pid > 0) {
		  wait(NULL);
		}
		free(parsed);
	}
}