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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--