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Linux Processes (Level 1) ⚙️

Viewing Processes

ps aux — View all running processes (a=all users, u=user oriented, x=no terminal).
top — Real-time view of system processes and resource usage.
htop — Interactive and colorful process viewer (easier to read than top).
jobs — List jobs in the current shell session.

Managing Processes

kill <PID> — Send SIGTERM signal to terminate a process by ID (Standard).
kill -9 <PID> — Send SIGKILL signal to forcefully kill a process (Use with caution).
pkill <name> — Kill processes by name.
killall <name> — Kill all processes with a specific name.

Background & Foreground

command & — Run a command in the background.
Ctrl+Z — Suspend the current foreground process.
bg — Resume a suspended job in the background.
fg — Bring a background job to the foreground.
nohup command & — Run a command that keeps running after logout.

Signals (Common)

1 (SIGHUP) — Reload configuration.
2 (SIGINT) — Interrupt from keyboard (Ctrl+C).
9 (SIGKILL) — Kill immediately (cannot be caught/ignored).
15 (SIGTERM) — Terminate gracefully (default for kill).