uptime - Tell how long the system has been running.
Examples using uptime with options
[tuyendq@rhel1 ~]$ uptime --pretty up 21 weeks, 3 days, 22 hours, 17 minutes [tuyendq@rhel1 ~]$ uptime -p up 21 weeks, 3 days, 22 hours, 17 minutes [tuyendq@rhel1 ~]$ uptime --since 2018-12-31 22:42:03 [tuyendq@rhel1 ~]$ uptime -s 2018-12-31 22:42:03 [tuyendq@rhel1 ~]$ uptime --version uptime from procps-ng 3.3.10 [tuyendq@rhel1 ~]$ uptime -V uptime from procps-ng 3.3.10 [tuyendq@rhel1 ~]$