告诉当前用户系统的运行时长。

用法：uptime [options]

# ubuntu
$ uptime
09:39:24 up 266 days, 15:14,  9 users,  load average: 0.04, 0.11, 0.15
$ nproc
80
# busybox
$ uptime
01:39:51 up  8:39,  load average: 0.71, 0.72, 0.69
$ nproc
1
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