does anyone has a script to get cpu average ?

Probably yes.

appreciate if someone provide one script to me

Most of us are busy with our own projects, so we're not likely to actually write scripts for you, but if you have a specific question about the behavior of a script you've already written, here's the place to ask it!

In the meantime, these aren't exactly scripts, but for a start, go here.

top - 19:37:42 up 14 days, 9:17, 6 users, load average: 0.00, 0.00, 0.00
Tasks: 91 total, 1 running, 90 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.2% us, 0.4% sy, 0.0% ni, 94.5% id, 1.7% wa, 0.1% hi, 0.0% si
Mem: 1555972k total, 949324k used, 606648k free, 92004k buffers
Swap: 2031608k total, 160k used, 2031448k free, 627112k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
13754 root 16 0 1948 832 652 R 3.9 0.1 0:00.02 top
1 root 16 0 3568 560 480 S 0.0 0.0 0:02.25 init



This the output of top command, as you can see there are seven outputs in cpu(s) row, how can I get CPU% as one value?

Those numbers add up to 99.9%. You can pretty well predict that the "one value" will always be very, very close to 100.0%. That makes your initial problem very, very simple, if I understand it correctly.

But if you want the sum of only some of those, use sed to isolate the numbers you want.

I'll give you a hint. 94.5% id means 94.5 percent IDLE.