last

The `last` command show listing of last logged-in users from the wtmp file. System information commands provide insight into hardware, kernel, memory, disk, and user session details.

These are typically the first tools you reach for when diagnosing system problems, capacity planning, or auditing a server's configuration. They work across most Linux distributions without additional packages.

The command accepts 4 commonly used flags shown above, though the full set of options is available in the man page (`man last`). The 4 examples on this page cover typical real-world usage patterns that you can copy and adapt for your own workflows.