What command is used to retrieve the cisco router total uptime since last boot?

#show version

is the command to check the uptime of the router

Router#show ver

Router uptime is 1 week, 6 days, 21 hours, 31 minutes

show version is the command to see the uptime and the time when it got rebooted last time. in Nexus, show system uptime is another command to see the same

router#sh uptime

is the command to check the uptime of the router