从正常运行时间grep出平均负载 [英] grep out load average from uptime

问题描述

我想要做的是获取命令正常运行时间，并获得平均负载

what I want to do is take the command uptime, and get the load averages

$ uptime
07:01:30 up 20:29,  2 users,  load average: 0.32, 0.39, 0.54

我感觉这是我可以用 awk 做的事情，但我不太确定如何做.请协助.

I have a feeling this is something I can do with awk, but I am not quite sure how. pls assist.

推荐答案

您可以使用带有反向引用的正则表达式:即查找任何字符序列 (.*) 但只能在 average 之后的一个点处:

You can use a regex with backreferences: i.e. find any sequence of characters (.*) but only at a point directly after average:

uptime  | grep -oP '(?<=average:).*'

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