# List current user's processes
ps

# List all processes
ps aux # detailed information
ps -ef # different format

# List processes in tree format
ps -ef --forest

# Filter by process name
ps aux | grep nginx

# Show specific columns
ps -o pid,user,cmd -p 1234

# Interactive process monitoring
top

# Non-interactive, update every 2 seconds
top -d 2 -n 5

# Sort by memory usage
top -o %MEM

# Sort by CPU usage
top -o %CPU

# Enhanced version of top (requires installation)
htop

# Tree view
htop -t

# Filter by user
htop -u username

# Find PID by process name
pgrep nginx
pidof nginx

# Get full command line
pgrep -a nginx

# Count processes matching pattern
pgrep -c nginx

# Run process in foreground
./script.sh

# Run process in background
./script.sh &

# Disown process (detach from terminal)
nohup ./long-running-script.sh &

# Use screen or tmux for persistent sessions
screen -S session-name
tmux new-session -s session-name

# Terminate process gracefully (SIGTERM)
kill PID
kill -15 PID

# Force kill process (SIGKILL)
kill -9 PID

# Kill all processes matching name
killall processname

# Kill processes by pattern
pkill -f "pattern"

# Kill all processes of a user
killall -u username

# Send to background (Ctrl+Z in foreground)
kill -STOP PID

# Resume background process
fg # bring to foreground
bg # continue in background
jobs # list background jobs

# Run with specific priority (-20 highest, 19 lowest)
nice -n 10 ./command

# Change priority of running process
renice 5 -p PID
renice 5 -u username

# Check current nice value
ps -o pid,user,nice,cmd

# View process memory usage
ps -o pid,user,%mem,rss,vsz,cmd

# Watch a command continuously
watch -n 2 'ps aux | grep nginx'

# Monitor system resources
free -h # memory
df -h # disk
iostat # I/O statistics

# List background jobs
jobs
jobs -l # with PID

# Bring job to foreground
fg %1

# Send job to background
bg %1

# Suspend current job
Ctrl+Z

# Disown job (keep running after logout)
disown %1

# Start/stop services
sudo systemctl start service-name
sudo systemctl stop service-name
sudo systemctl restart service-name

# Enable/disable on boot
sudo systemctl enable service-name
sudo systemctl disable service-name

# Check status
sudo systemctl status service-name

# View logs
sudo journalctl -u service-name