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Uptime is a measure of the time a computer system has been up and running. It came into use to describe the opposite of downtime, times when a system was non-operational.
It is often used a measure of computer operating system reliability and stability, in that this time represents the time a computer can be left unattended without crashing, or needing to be rebooted for administrative or maintenance purposes.
Netcraft maintains the uptime records for many thousands of web hosting computers.
The appropriately-named uptime command will report a system's uptime on most Unix-based systems.
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