# Display list of last reboot entries: 
last reboot | less

# Display list of last shutdown entries: 
last -x | less
last -x | grep shutdown | less

# Display logs from last shutdown
journalctl -b -1 -n250
# where -b would show you the journal of the current bootup and -b -1 the journal of the one before. With -n250 your journalctl will show you the last 250 lines only