IRIX:
=================

/var/adm/SYSLOG
/var/adm/sulog
/var/adm/utmp
/var/adm/utmpx
/var/adm/wtmp
/var/adm/wtmpx
/var/adm/lastlog/username
/usr/spool/lp/log
/var/adm/lp/lpd-errs
/usr/lib/cron/log
/var/adm/loginlog
/var/adm/pacct
/var/adm/dtmp
/var/adm/acct/sum/loginlog
/var/adm/X0msgs
/var/adm/crash/vmcore
/var/adm/crash/unix

AIX:
=================

/var/adm/pacct
/var/adm/wtmp
/var/adm/dtmp
/var/adm/qacct
/var/adm/sulog
/var/adm/ras/errlog
/var/adm/ras/bootlog
/var/adm/cron/log
/etc/utmp
/etc/security/lastlog
/etc/security/failedlogin
/usr/spool/mqueue/syslog

SunOS:
=================

/var/adm/messages
/var/adm/aculogs
/var/adm/aculog
/var/adm/sulog
/var/adm/vold.log
/var/adm/wtmp
/var/adm/wtmpx
/var/adm/utmp
/var/adm/utmpx
/var/adm/log/asppp.log
/var/log/syslog
/var/log/POPlog
/var/log/authlog
/var/adm/pacct
/var/lp/logs/lpsched
/var/lp/logs/lpNet
/var/lp/logs/requests
/var/cron/log
/var/saf/_log
/var/saf/port/log

Linux:
=================

/var/log/lastlog
/var/log/telnetd
/var/run/utmp
/var/log/secure
/root/.ksh_history
/root/.bash_history
/root/.bash_logut
/var/log/wtmp
/etc/wtmp
/var/run/utmp
/etc/utmp
/var/log
/var/adm
/var/apache/log
/var/apache/logs
/usr/local/apache/log
/usr/local/apache/logs
/var/log/acct
/var/log/xferlog
/var/log/messages
/var/log/proftpd/xferlog.legacy
/var/log/proftpd.access_log
/var/log/proftpd.xferlog
/var/log/httpd/error_log
/var/log/httpd/access_log
/etc/httpd/logs/access_log
/etc/httpd/logs/error_log
/var/log/httpsd/ssl.access_log
/var/log/httpsd/ssl_log
/var/log/httpsd/ssl.access_log
/etc/mail/access
/var/log/qmail
/var/log/smtpd
/var/log/samba
/var/log/samba-log.%m
/var/lock/samba
/root/.Xauthority
/var/log/poplog
/var/log/news.all
/var/log/spooler
/var/log/news
/var/log/news/news
/var/log/news/news.all
/var/log/news/news.crit
/var/log/news/news.err
/var/log/news/news.notice
/var/log/news/suck.err
/var/log/news/suck.notice
/var/spool/tmp
/var/spool/errors
/var/spool/logs
/var/spool/locks
/usr/local/www/logs/thttpd_log
/var/log/thttpd_log
/var/log/ncftpd/misclog.txt
/var/log/ncftpd.errs
/var/log/auth

Red Hat, Mac OS X
=================

/var/log/httpd/access_log
/var/log/httpd/error_log

Solaris
=================

/var/apache/logs/access_log
/var/apache/logs/error_log

SuSE Linux Enterprise Server
=================

/var/log/httpd/access_log
/var/log/httpd/error_log

lampp
=================

/opt/lampp/logs/error_log
/opt/lampp/logs/access_log

Debian
=================

/var/log/apache/access.log
/var/log/apache/error.log
/var/log/apache-ssl/error.log
/var/log/apache-ssl/access.log

FreeBSD
=================

/usr/local/etc/httpd/logs/access_log
/usr/local/etc/httpd/logs/error_log

OpenBSD
=================

/var/www/log/access_log
/var/www/log/error_log

Windows
=================

C:\Program Files\Apache Group\Apache\logs\error.log
C:\Program Files\Apache Group\Apache\logs\access.log
c:\apache\logs\error.log
c:\apache\logs\access.log

Other Possible Locations
/etc/httpd/logs/access.log
/etc/httpd/logs/error.log
/etc/httpd/logs/access_log
/etc/httpd/logs/error_log
/usr/local/apache/logs/access_log
/usr/local/apache/logs/error_log
/usr/local/apache/logs/access.log
/usr/local/apache/logs/error.log
/var/log/apache/access_log
/var/log/apache/error_log
/var/log/apache/access.log
/var/log/apache/error.log
/var/log/access_log
/var/log/error_log
/var/www/logs/error.log
/var/www/logs/access.log
/var/www/logs/error_log
/var/www/logs/access_log

Если есть дополнения пишите - добавлю