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uptime shows how long the Linux kernel has been running. This give the user who invokes the command an idea of how long the computer has been running. If uptime shows a time shorter than expected, the user knows that the computer has been rebooted recently. I use it often when I SSH into a remote computer on which I've been running updates. If I want to know whether or not the computer has been restarted, I run uptime. That way I know whether or not to look for processes which need to be manually restarted.

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In addition, uptime shows how many users are connected to the system as well as the average system loads for the past few time intervals. This is useful if you want to know how much computing power is being allocated to the total number of users connected.

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