Linux system cleaning

clean.sh

#!/bin/bash

# Check for root
if [[ "$(id -u)" != "0" ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# Remove old kernels
apt autoremove

# Remove old and unused packages
apt-get autoremove

# Clear package cache
apt-get clean

# Remove old package lists
rm -rf /var/lib/apt/lists/*
apt-get update

# Remove offline documentations
#apt-get remove *-doc