//I create a pipe in which i switch stdout by its writing side so i can get the result of execvp.
if(pipe(exec2reduce) == -1) {
  perror("pipe");
  return -1;
}

if(dup2(exec2reduce[1],1) == -1) {
  perror("dup2");
  return -1;
}

//I create a new process using fork to run execvp but the parent waits idefinitely.
pid = fork();

if(pid == -1) {
  perror("fork");
  return -1;
}

if(pid == 0) {
  if(execvp(command,args) == -1) {
    perror("execvp");
    _exit(EXIT_FAILURE);
  }
    _exit(EXIT_SUCCESS);
}

wait(&retvar);
if(!WIFEXITED(retvar)) {
  return -1;
}
else {
  if(WEXITSTATUS(retvar) == EXIT_FAILURE) {
    return -1;
  }
}