$ ls -l spw586856*    
-rwxr-xr-x   1 jgillman og5a        1895 Dec  1 11:11 spw586856
-rw-r--r--   1 jgillman og5a     2507626 Dec  1 10:58 spw586856.log
-rwxr-xr-x   1 jgillman og5a         696 Dec  1 10:56 spw586856makeData
$ wc spw586856.log
   47712  332470 2507626 spw586856.log
$ head -10 spw586856.log
2006-06-11.05:26:40 Random message
2006-06-11.05:27:13 This message is intentionally blank
2006-06-11.05:28:00 Chickens have got into the server
2006-06-11.05:28:33 The lunatics have taken over the asylum
2006-06-11.05:29:16 Chickens have got into the server
2006-06-11.05:29:53 The lunatics have taken over the asylum
2006-06-11.05:30:34 The disk drive just wants you to know it is fine
2006-06-11.05:30:52 The lunatics have taken over the asylum
2006-06-11.05:31:32 All your data is gone
2006-06-11.05:31:52 All your data is gone
$ tail -10 spw586856.log
2006-06-19.11:51:40 Chickens have got into the server
2006-06-19.11:51:56 Random message
2006-06-19.11:52:44 Random message
2006-06-19.11:52:50 All your data is gone
2006-06-19.11:52:58 This message is intentionally blank
2006-06-19.11:53:44 The lunatics have taken over the asylum
2006-06-19.11:54:07 This message is intentionally blank
2006-06-19.11:54:35 The disk drive just wants you to know it is fine
2006-06-19.11:54:51 Chickens have got into the server
2006-06-19.11:55:33 Chickens have got into the server
$ time spw586856        
Threshhold : 2006-06-19.11:47:25
Line No.   : 47694
Log msg.   : 2006-06-19.11:47:27 This message is intentionally blank
Prev. msg. : 2006-06-19.11:47:20 Chickens have got into the server

Lines from threshhold onwards

2006-06-19.11:47:27 This message is intentionally blank
2006-06-19.11:47:47 The disk drive just wants you to know it is fine
2006-06-19.11:48:36 The lunatics have taken over the asylum
2006-06-19.11:49:12 All your data is gone
2006-06-19.11:49:28 This message is intentionally blank
2006-06-19.11:50:01 Chickens have got into the server
2006-06-19.11:50:10 This message is intentionally blank
2006-06-19.11:50:38 Chickens have got into the server
2006-06-19.11:51:24 Random message
2006-06-19.11:51:40 Chickens have got into the server
2006-06-19.11:51:56 Random message
2006-06-19.11:52:44 Random message
2006-06-19.11:52:50 All your data is gone
2006-06-19.11:52:58 This message is intentionally blank
2006-06-19.11:53:44 The lunatics have taken over the asylum
2006-06-19.11:54:07 This message is intentionally blank
2006-06-19.11:54:35 The disk drive just wants you to know it is fine
2006-06-19.11:54:51 Chickens have got into the server
2006-06-19.11:55:33 Chickens have got into the server

real    0m5.28s
user    0m4.86s
sys     0m0.34s
$