Linux common system logs and comments:
/var/log/lastlog: Record the last time the user successfully logged in, login IP and other information
/var/log/messages: Documenting common system and service error messages for Linux operating systems
/var/log/secure:linux system security log, record user and workgroup deterioration situation, user login authentication situation
/VAR/LOG/BTMP: Logs the user, time, and remote IP address of a Linux login failure
/var/log/cron: Documenting Crond Scheduled Tasks and the execution of at services
/var/log/spooler: Log information related to UUCP and news devices
/var/log/boot.log: Daemon starts and stops related log messages
/var/log/maillog: Message information related to system users
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Linux System Log Description