>>396
tail -f /var/log/apache/access.log > taillog.0 & \
tail -f /var/log/apache/access.log | awk '{print $0}'> taillog.1

の時のdiff taillog.0 taillog.1|head -n 5
44,90c44
< 192.168.0.5 - - [01/Jun/2003:14:16:34 +0900] "GET /diary/img/020927_1.png HTTP/1.1" 304 - "http://nmnl.jp/diary/200209.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)"
< 192.168.0.5 - - [01/Jun/2003:14:16:34 +0900] "GET /diary/img/020928.png HTTP/1.1" 304 - "http://nmnl.jp/diary/200209.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)"
< 192.168.0.5 - - [01/Jun/2003:14:16:35 +0900] "GET /diary/200208.html HTTP/1.1" 200 9710 "http://nmnl.jp/diary/200209.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)"
< 192.168.0.5 - - [01/Jun/2003:14:16:35 +0900] "GET /diary/img/020802.jpg HTTP/1.1" 304 - "http://nmnl.jp/diary/200208.html" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)"

diff taillog.0 taillog.1|tail -n 4
< 210.159.*.* - - [01/Jun/2003:14:20:44 +0900] "HEAD /diary/ HTTP/1.1" 304 - "http://*.jp/" "comusai[NATSU-MICAN]/3.1b(20010312)"
---
> 220.98.*.* - - [01/Jun/2003:14:16:34 +0900] "GET /diary/
\ No newline at end of file

cat taillog.0|wc
119 2329 22020

cat taillog.1|wc
43 871 8192

でした。awkはmark の1.2です。OSはDebian woodyです。