Lan Yiyun: Linux basic skills series uptime command

The uptime command is used in Linux systems to view the running time and load average of the system. It provides information about system uptime, the number of currently logged-in users, and system load. The following is a detailed explanation of the uptime command:

1. Command format:

uptime

1. Output information:
   The output information of the uptime command includes the following parts:

• Current time: Display the current system time.
• Running time: Displays the running time of the system from startup to now.
• Number of users: Displays the number of currently logged in users.
• Load average: Displays the average load in the last 1 minute, 5 minutes and 15 minutes.

1. Load average explanation:
   Load average refers to the number of processes running and waiting to be executed in the system. It is an indicator of how busy the system is. The value of average load can be greater than 1, indicating that the system load exceeds the system's physical processing capabilities. Generally speaking, it is ideal for the average load to be less than the number of CPU cores in the system.
2. Usage Examples:
   Here are some examples of using the uptime command:

• View your system's uptime and load average:

uptime

Output example:

 09:32:15 up 10 days,  2:43,  3 users,  load average: 0.08, 0.12, 0.17

"10 days, 2:43" in the output means that the system has been running for 10 days, 2 hours and 43 minutes. "3 users" means that there are currently 3 users logged into the system. The three values ​​after "load average" represent the last minute respectively. , 5-minute and 15-minute load averages.

The uptime command provides a quick way to view system running time and load conditions. It is very useful for monitoring the health status of the system and evaluating system resource usage. Based on the average load value, you can determine whether the system is busy and make corresponding adjustments and optimizations accordingly.

Please note that the above is a detailed explanation and usage example of the uptime command. Use the uptime command to quickly understand the running time and load of the system, which helps monitor and evaluate system performance.