grep restart /var/adm/syslog
That will only work if the sysadmin does not ever age syslog between reboots.
@reachdharam
What is the link to the new thread?
Overall listing O/S restarts depends on whether you elect to save the information. This could be in unix syslog files or in unix system accounting files. Unix is not M$ and unix servers which stay up for years are not unusual.