How well do you know Linux?

I am well acquainted with Linux at the level of a system administrator and user. I can work with the command line, manage processes, configure networks, work with the file system and access rights. I know the basic monitoring and logging tools, and can write simple bash scripts for automating routine tasks.

An example of a basic command to find and count the number of nginx processes:

ps aux | grep nginx | wc -l

I am also familiar with configuring system services via systemd, managing packages (apt, yum), and basic security principles in Linux.