60 related command entries are available in Commands.
Processes
Programs, processes, services, CPU, memory, and performance diagnosis.
Processes
Processes
Use Processes when you need to understand what is running, why the system feels slow, how jobs and services differ, and how to inspect before acting.
This domain is public-ready across Learning, Practice, Troubleshooting, and Reference.
What you will learn
- Distinguish program, process, job, and service clearly
- Inspect before terminating or changing a running workload
- Read system pressure signals before blaming the wrong subsystem
Coverage in this domain
Best when you need to inspect CPU, memory, jobs, or service behavior without guesswork.
Lesson order
Start at the top and move forward if you want the full learning path for this domain.
Lesson 1 Processes
Process Model: What Processes Are Understand the difference between a program stored on disk and a process running in memory, and learn the basic ideas of PID, parent process, and thread. Lesson 2 Processes
Process Management: GUI Use graphical system tools to observe process activity, spot obvious resource pressure, and end unresponsive apps more deliberately. Lesson 3 Processes
Process Management: CLI List, filter, and stop processes from the command line with a stronger habit of inspecting before terminating. Lesson 4 Processes
Background and Foreground Understand how foreground work, background jobs, and persistent sessions differ so long-running commands do not surprise you or die unexpectedly. Lesson 5 Processes
Performance Diagnosis Check CPU, memory, and disk pressure more systematically so a slow system is diagnosed from evidence instead of guesses. Lesson 6 Processes
Process Lab: Sluggish System Use safe practice loads to observe a slow system, identify the cause, and restore normal behavior without guessing or overreacting. Practice this domain PROCESS & RESOURCE MANAGEMENT
The Process Lifecycle
Inspect running processes, identify PIDs, and connect a few basic commands to the process model without needing advanced process theory yet.
Process Management Live Monitoring: top and htopUse live process monitors to see changing CPU and memory activity without confusing a live view with a one-time snapshot.
Process Management Signals and Controlled StoppingUnderstand basic process signals and practice stopping harmless processes with a preference for gentler signals first.
Process Management Foreground and Background JobsPractice basic bash job control so you can pause, resume, background, and foreground simple commands without panic.
Process Management Fix related problems
A Process Will Not Stop Cleanly
Use this when a process ignores normal stop attempts and you need to decide whether to wait, terminate, or investigate dependencies.
Performance and Memory A Service Keeps RestartingUse this when a background service starts, fails, and restarts repeatedly.
Apps and Packages The System Feels SlowUse this when the machine feels sluggish and you need to decide whether the pressure is CPU, memory, disk, startup load, or one runaway process.
Performance and Memory Reference quick access
Check What Is Using Memory
Find which processes are consuming memory and decide whether the problem is one process, many processes, or overall system pressure.
Task guide Inspect Running Services SafelyCheck whether a service is running, restarting, stopped, or unhealthy before you restart or kill anything.
Task guide Process Lifecycle and Service FlowUnderstand how programs become processes, how jobs differ from services, and where CPU and memory pressure appear.
Flow map CPU, Memory, and Disk Pressure MapSeparate CPU, memory, and disk pressure into distinct diagnostic paths instead of calling everything a performance problem.
Matrix