Jul 24 09:21:55 gw3 /netbsd: Copyright (c) 1996, 
Jul  8 09:26:10 gw3 /netbsd: Copyright (c) 1996, 
Jul 14 09:22:19 gw3 /netbsd: Copyright (c) 1996, 
Jul 14 09:26:47 gw3 /netbsd: Copyright (c) 1996, 
Apr 14 09:40:41 gw3 /netbsd: Copyright (c) 1996, 
Apr 14 09:46:44 gw3 /netbsd: Copyright (c) 1996, 
Apr 17 09:44:26 gw3 /netbsd: Copyright (c) 1996, 
May 11 09:51:28 gw3 /netbsd: Copyright (c) 1996, 
May 19 09:40:38 gw3 /netbsd: Copyright (c) 1996, 
Feb 20 09:41:04 gw3 /netbsd: Copyright (c) 1996, 

 cat /var/log/messages  | grep 'Copyright (c) 1996,' | grep 09: 

gw3@makoto 22:19:25/160724(~)%  foreach i (`seq 0 9`)
zcat /var/log/messages.$i.gz | grep 'Copyright (c) 1996,' | grep 09:
end

gw3@makoto 22:25:16/160724(~)%  foreach i (`seq 0 9`)
zcat /var/log/messages.$i.gz | grep 'Copyright (c) 1996,' |cut -b 1-47
end
Jul  7 05:34:08 gw3 /netbsd: Copyright (c) 1996
Jul  8 09:26:10 gw3 /netbsd: Copyright (c) 1996
Jul 12 02:56:09 gw3 /netbsd: Copyright (c) 1996
Jul 14 09:22:19 gw3 /netbsd: Copyright (c) 1996
Jul 14 09:26:47 gw3 /netbsd: Copyright (c) 1996
Jul 15 19:37:07 gw3 /netbsd: Copyright (c) 1996
Jul 16 10:40:41 gw3 /netbsd: Copyright (c) 1996
Jul 19 02:57:53 gw3 /netbsd: Copyright (c) 1996
Jul 19 19:35:09 gw3 /netbsd: Copyright (c) 1996
Jul 20 03:06:42 gw3 /netbsd: Copyright (c) 1996
Jul 20 10:35:42 gw3 /netbsd: Copyright (c) 1996
Jul 21 20:20:35 gw3 /netbsd: Copyright (c) 1996
Feb 21 18:45:10 gw3 /netbsd: Copyright (c) 1996
Feb 26 15:18:24 gw3 /netbsd: Copyright (c) 1996
Mar  4 17:50:11 gw3 /netbsd: Copyright (c) 1996
Mar  4 17:57:12 gw3 /netbsd: Copyright (c) 1996
Apr 14 09:40:41 gw3 /netbsd: Copyright (c) 1996
Apr 14 09:46:44 gw3 /netbsd: Copyright (c) 1996
Apr 17 09:44:26 gw3 /netbsd: Copyright (c) 1996
Apr 24 05:15:20 gw3 /netbsd: Copyright (c) 1996
May 11 09:51:28 gw3 /netbsd: Copyright (c) 1996
May 19 09:40:38 gw3 /netbsd: Copyright (c) 1996
Jul  1 08:55:14 gw3 /netbsd: Copyright (c) 1996
Feb 11 12:17:45 gw3 /netbsd: Copyright (c) 1996
Feb 14 21:14:45 gw3 /netbsd: Copyright (c) 1996
Feb 16 17:10:16 gw3 /netbsd: Copyright (c) 1996
Feb 20 09:41:04 gw3 /netbsd: Copyright (c) 1996