% 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>

# Get IP on interface
ip addr show dev <interface> | grep "inet " | sed "s/ *inet \([^ ]*\) .*/\1/" | awk -F: '{ print $1}'

# Get devices on interface
nmap -sP <ip>

# Compare 2 files (meld)
meld <(hexdump -C <file_1>) <(hexdump -C <file_2>)

# Compare 2 files (bcompare)
bcompare <file_1> <file_2>

# Disable Bluetooth ERTM
sudo bash -c "echo Y > /sys/module/bluetooth/parameters/disable_ertm"

$ user: cat /etc/passwd | awk -F: '{ print $1}'
$ group: cat /etc/group | awk -F: '{ print $1}'
$ interface: ip link | grep "^[0-9]*:" | sed "s/[0-9]*: \(.*\):.*/\1/" | awk -F: '{ print $1}'
$ ip: ip addr show dev <interface> | grep "inet " | sed "s/ *inet \([^ ]*\) .*/\1/" | awk -F: '{ print $1}'
$ file_1: ls | awk -F: '{ print $1}'
$ file_2: ls | awk -F: '{ print $1}'