Page History

...

/var/log/auth.log or /var/log/secure - Stores authentication logs, including both successful and failed logins and authentication methods. Debian/Ubuntu information is stored in /var/log/auth.log, while Redhat/CentrOS is stored in /var/log/secure.

/var/log/

...

/var/log/yum.log - Red Hat-based systems store the yum and dnf package manager logs, file provides information about the results of a specific command, such as any errors or warnings that were generated. For example, if a package update fails.

/var/log/dmesg
dmesg allows reviewing messages stored in the Linux ring buffer, providing insights into hardware errors and dmesg
dmesg allows reviewing messages stored in the Linux ring buffer, providing insights into hardware errors and startup issues. How To Use dmesg

...

 tail /var/log/syslog

Jun 18 16:25:01 user CRON[777810]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Jun 18 16:27:02 user dbus-daemon[756]: [system] Activating service name='org.kde.powerdevil.backlighthelper' requested by ':1.49' (uid=1000 pid=1527 comm="/usr/lib/x86_64-linux-gnu/libexec/org_kde_powerdev" label="unconfined") (using servicehelper)
Jun 18 16:27:02 user dbus-daemon[756]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'

/var/log/apt directory - contains several log files that provide important information about apt-related activities on Debian-based systems.

/var/log/yum.log - Red Hat-based systems store the yum and dnf package manager logs, file provides information about the results of a specific command, such as any errors or warnings that were generated. For example, if a package update fails.

.home-banner {
                    background: #459df0;
                    color: #fff;
                    font-size: 20px;
                    padding: 20px;
                    }
                    .home-banner h2 {
                    color: #fff;
                    }
                    .title-box {
                    border: 1px none #459df0;
                    padding: 10px;
                    }
                    .title-box > h2 {
                    background: #459df0;
                    bottom: 10px;
                    color: #fff;
                    margin-left: -10px;
                    margin-right: -10px;
                    padding: 2px 10px;
                    position: relative;
                    }

...