Using "sar" to check the CPU utilization, current and historical data

For example, to get the CPU for day #6 of the month, only top 30 CPU entries:

>sar -f /var/log/sa/sa06|awk -F" " '{print $4}'|sort -n|tail -30

15.84

19.12

19.64

22.70

23.79

24.06

31.20

32.69

35.55

36.79

37.41

39.59

40.39

43.41

44.62

45.28

46.34

47.20

47.63

60.93

63.28

64.77

64.80

65.31

67.07

67.64

68.44

69.44

69.67

71.79

 How to check the CPU right now? Below is running "live" every 2 seconds, for 10 seconds.

>sar -u 2 10