Linux Log files and usage

/var/log/messages : General log messages

/var/log/boot : System boot log

/var/log/debug : Debugging log messages

/var/log/auth.log : User login and authentication logs

/var/log/daemon.log : Running services such as squid, ntpd and others log message to this file

/var/log/dmesg : Linux kernel ring buffer log

/var/log/dpkg.log : All binary package log includes package installation and other information

/var/log/faillog : User failed login log file

/var/log/kern.log : Kernel log file

/var/log/lpr.log : Printer log file

/var/log/mail.* : All mail server message log files

/var/log/mysql.* : MySQL server log file

/var/log/user.log : All userlevel logs

/var/log/xorg.0.log : X.org log file

/var/log/apache2/* : Apache web server log files directory

/var/log/lighttpd/* : Lighttpd web server log files directory

/var/log/fsck/* : fsck command log

/var/log/apport.log : Application crash report / log file

To view log files at shell prompt

Use tail, more, less and grep command.

tail -f /var/log/apport.log
more /var/log/xorg.0.log
cat /var/log/mysql.err
less /var/log/messages
grep -i fail /var/log/boot</code>

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