At/etc/at.allow /etc/at.deny (allow deny access to at)BASHUnderstanding the BASH and Profile filesCron/etc/cron.allow and /etc/cron.denyDevices/udev/rules.dDNS/etc/resolv.conf (DNS)Filescron logJournalUnderstanding the /etc/systemd/journald.conf fileLogsUnderstanding the /etc/logrotate.conf fileMount/etc/fstab (mount partition or share)SchedulingUnderstanding the /etc/anacron file in LinuxsudoUnderstanding the /etc/sudoers file in LinuxTime ZoneUnderstanding the /etc/timezone and /etc/localtime filesUsers and GroupsUnderstanding the /etc/passwd fileUnderstanding the /etc/shadow fileYumyum repos