熟悉的就不列出了
1.uptime
13:18:27 up 79 days, 1:34, 1 user, load average: 1.26, 1.77, 2.08
13:18:27 指当前时间 up 79 days指开机运行了79天了，一般这个值越大，说明这个服务器性能越稳定, 1:34 说明运行了79天1小时34分钟
1 user 指当前连接服务器的只有1个用户
最重要的时这个 load average:
man uptime的描述如下
DESCRIPTION
uptime gives a one line display of the following information. The current time, how long the system has been running, how many
users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.
This is the same information contained in the header line displayed by w(1).
System load averages is the average number of processes that are either in a runnable or uninterruptable state. A process in a
runnable state is either using the CPU or waiting to use the CPU. A process in uninterruptable state is waiting for some I/O
access, eg waiting for disk. The averages are taken over the three time intervals. Load averages are not normalized for the
number of CPUs in a system, so a load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it
means it was idle 75% of the time.
以下时google翻译