Xin chao
# Port and Process
lsof -i :8080
ps aux
ps -fp 1234
kill 1234
kill -9 1234# Systemctl
sytemctl start docker
systemctl stop docker
systemctl stop ufw
systemctl status ufw
sudo ufw status# Disk
df -h #disk free
du -h --max-depth=1 | sort -hr # disk free with sort
lsblk -f# Firewall
sudo ufw status
sudo ufw enable
sudo ufw allow 81
sudo ufw delete allow 81