Which command would you use to reboot a Linux system?

All the mentioned commands—shutdown -r now, reboot, and systemctl reboot—are valid methods to reboot a Linux system, reflecting the versatility of Linux in system management.

Using shutdown -r now initiates a shutdown process, where the system is gracefully brought down and then restarted immediately. The option -r signifies that the system should reboot after shutdown. This method allows for a clean shutdown, ensuring that all services are stopped properly before the system reboots.

The reboot command is a straightforward and direct way to reboot the system. It essentially tells the Linux kernel to reboot immediately. This command also generally allows for a more rapid restart compared to the shutdown approach, which processes stopping services more carefully.

systemctl reboot is a part of the systemd system management suite, which has become prevalent in many modern Linux distributions. This command does everything that a traditional reboot would do, but it does so in a manner that is consistent with the controlling of system services and states under systemd.

Each of these commands operates effectively to achieve the same end result—rebooting the system. Their coexistence provides users with flexibility to choose an approach that best fits their situation or preference. Thus, stating that all provided options can be utilized correctly supports the answer choice indicating