Ruby：从顶部-n1输出获取CPU（un）

Question

I want to save the output from this for example:

%Cpu(s):  9,0 be,  2,5 sy,  0,2 ni, 88,2 un,  0,0 wa,  0,0 hi,  0,0 si,  0,0 st

into a interger, but I only need the number before the "un" chars. It's the output of top -n1 of a Linux Server. The numbers of the output change every second. Btw. sry for my bad english...

Answer 1

An integer cannot hold a fraction number like 88,2 . For a floating point number, you could use

output = "%Cpu(s):  9,0 be,  2,5 sy,  0,2 ni, 88,2 un,  0,0 wa,  0,0 hi,  0,0 si,  0,0 st"
number = output[/[0-9,]* un/].tr(',', '.').to_f