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This article introduces the knowledge of "the specific usage of the Linux Uptime command". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

For some people, it doesn't matter how long the system runs, but for server administrators, this is very important information. When running important applications, the server must ensure stable operation for a long time as far as possible, and sometimes even require zero downtime. So how do we know how long the server has been running?

Under Linux, we can use the uptime command, and this command does not have to use root permissions. The uptime command is installed by default on the system.

The syntax is as follows:

$uptime

You will see the following on the screen:

This information is saved in the / proc/uptime file, although it is saved as text, but the data cannot be displayed directly, which requires us to use the uptime command to translate it.

Here is how to interpret the information provided by uptime:

System time

In figure 1, the message from the left is 14:04:39, which is the current system time, output in a 24-hour format.

System running time

The second message is Up 1004 days, 12:20, which shows the running time of your system. Figure 1 shows that your system has been running for 1004 days, 12 hours and 20 minutes. If your system is not running for more than 24 hours, only hours and minutes will be displayed here. Note the information in figure 2 and figure 3, which will be cleared when the system is rebooted.

Number of logged-in users

The third part of the information is to show the number of users who have logged in. In figure 1, 1 user is shown, which is the number of currently logged-in users. When multiple users log in to the system at the same time, the uptime command will tell you the number of users.

Average load

* A message is the average load of the system. Going back to figure 1, you can see that the numbers 0.25, 0.25, 0.19 with two decimal places can be converted into percentages, that is, 0.25 and 0.19 represent 25% and 19%, respectively. 0.25,0.25,0.19 represent the average load of the system in the past 1 minute, 5 minutes and 15 minutes, respectively. The lower the load, the better your system performance.

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