← Linux Admin theorytheory 0/4 · 0%

level 1

Curious · 0 XP

streak

perfect

badges

100 XP to Apprentice

Operations · medium

4. Process Management & systemd Service Units

ps, top, kill, and systemctl.

1 min read2 questionsup to 50 XPtopic 4/4

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

Processes are inspected with `ps aux | grep name`, `top`, `htop`, or `lsof -i :port`. System services are managed via systemd:

ini
# /etc/systemd/system/node-service.service
[Unit]
Description=Validator Node
After=network.target

[Service]
ExecStart=/usr/local/bin/node
Restart=always
User=nodeuser

[Install]
WantedBy=multi-user.target

How to study this topic

1. Read the explanation once end to end, skipping the code.
2. Re-read the code snippets and say out loud what each line does.
3. Answer the quiz without scrolling back — that is the real check.
4. Read every explanation, even for the answers you got right.

Scoring

· Up to 30 XP from quiz accuracy.
· +15 XP for a perfect first attempt.
· +5 XP while a 3-day streak is running.
· 75% or higher marks the topic complete.

Check your understanding

1. Which command reloads systemd configurations after editing a .service file?
sudo systemctl daemon-reloadsudo systemctl restartservice updatesystemd reload
2. Which signal corresponds to a graceful termination request in Linux (SIGTERM)?
kill -15 (SIGTERM)kill -9 (SIGKILL)kill -1 (SIGHUP)kill -2 (SIGINT)

Badges

First light

Pass your first topic

Sharp shooter

3 perfect first-try quizzes

On a roll

Study 3 days in a row

Week warrior

Study 7 days in a row

Grinder

Earn 500 XP

Deep diver

Earn 1500 XP