level2@student05:~$ grep -C 10 s_err /levels/level3.c

        case 'c':
        case 'n':
          count_lines = (c == 'n');
          if (*optarg == '+')
            from_start = true;
          else if (*optarg == '-')
            ++optarg;

          {
            strtol_error s_err;
            strcpy(arg, optarg);
          }
          break;

        case 'f':
        case LONG_FOLLOW_OPTION:
          forever = true;
          if (optarg == NULL)
            follow_mode = DEFAULT_FOLLOW_MODE;
          else
--