text: #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  int main(int argc, char **argv) {
      if(argc < 2) {
          printf("%s: missing operand\n", argv[0]);
          return 1;
      }
  
      sleep(atoi(argv[1]));
  
      return 0;
  }
  