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You saw that every user has a UID and that sudo lets you become root. Now: what lives inside that UID, namely processes. They have their own PIDs and parents, and they can talk to each other with signals.
Базовый
12 мин · урок входит в курс «Базовый»
Every command is a process-and-pid. A process has a PID (a numeric identifier), a parent (PPID), a status, an owner, and a set of open files. Managing processes means managing their lifecycle through signals: TERM (a request to terminate, which the process can handle), KILL (an immediate kill that cannot be handled), HUP, INT (Ctrl+C), and others.
Чтобы запустить sandbox и пройти этот урок целиком, нужен соответствующий курс. Внутри - ещё много практических уроков того же уровня и сквозной прогресс.
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Processes exist, but how do you tell when the system is overloaded by
them? Next: load average and the three numbers in uptime that people
usually look at first when a machine feels "slow".