https://drive.google.com/file/d/1K4bmrFAw-tO9YJGITHPgqD5zFeO_GeD_/view?usp=sharing

1. Viewing Processes

pstree

Shows processes in a tree hierarchy (parent → child relationships).

pstree

ps

Lists current processes. Common options:

ps fx          # Full-format listing with hierarchy
ps -C sleep    # Show all processes named "sleep"

top

Interactive real-time process monitor.

• Press k → enter PID → Enter to kill a process.
• Press q to quit.

jobs

Shows background jobs in the current shell (not system-wide processes).

jobs           # List jobs: [1]+ Running sleep 200 &

2. Sending Signals to Processes

Understanding Signals

Processes communicate via signals. Common ones: