bash-3.1# zgrep time /var/log/messages /var/log/messages.0.gz
/var/log/messages:Sep  6 20:49:23 shapai /netbsd: rtk1: watchdog timeout
/var/log/messages:Sep  7 09:16:08 shapai /netbsd: rtk1: watchdog timeout
/var/log/messages.0.gz:Sep  4 12:44:15 shapai last message repeated 4 times
/var/log/messages.0.gz:Sep  4 12:45:27 shapai last message repeated 2 times
/var/log/messages.0.gz:Sep  4 14:22:32 shapai last message repeated 5 times
/var/log/messages.0.gz:Sep  4 14:33:31 shapai last message repeated 6 times
/var/log/messages.0.gz:Sep  4 17:08:53 shapai last message repeated 2 times
/var/log/messages.0.gz:Sep  4 17:10:07 shapai last message repeated 4 times