% misc

# Update system
sudo apt update && sudo apt upgrade

# Clean APT
sudo apt autoclean && sudo apt autoremove

# List users
cat /etc/passwd | awk -F: '{ print $1}'

# User information
sudo id <user>

# Change user password
sudo passwd <user>

# Create user with home
sudo useradd -m <username>

# Create user without home
sudo useradd <username>

# Delete an user
sudo deluser <user>

# List all groups
cat /etc/group

# Add user to group
sudo usermod -a -G <group> <user>

# Remove user from a group
sudo deluser <user> <group>

# Port binding
sudo lsof -i:<port>

$ user: cat /etc/passwd | awk -F: '{ print $1}'
$ group: cat /etc/group | awk -F: '{ print $1}'