Linux 11 log file should know
/var/log/messages : General message and system related stuff/var/log/boot.log : Services success/failures at boot
/var/log/secure or /var/log/auth.log : Authentication log
/var/log/utmp or /var/log/wtmp : Login records
/var/log/btmp : Failed login records
/var/log/cron : Scheduler log file
/var/log/maillog : Mail logs
/var/log/xferlog : File transfer logs
/var/log/lastlog : Last login details
dmesg : Device driver messages
/var/crash logs : System crash dump
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