clean-system.sh

#!/usr/bin/env bash
# @title: Clean System
# @description: Removing unused apt packages, kernels, thumbnail cache, and docker objects.
# Tested on Ubuntu Server 20.04 LTS and Raspberry Pi OS

# Variables for pretty printing
RED=$(tput bold)$(tput setaf 1)   # Red Color
GREEN=$(tput bold)$(tput setaf 2) # Green Color
NC=$(tput sgr0)                   # No Color
BEGIN=$(df /home --output=used | grep -Eo '[0-9]+')

# Checking root/sudo permissions
if [ "$(id -u)" -ne "0" ]; then
    echo "${RED}Please run as root${NC}"
    exit
fi

# Removing unused packages and cache (APT)
echo -e "${RED}Cleaning Unused Packages...${NC}" &&
    sudo apt-get -y autoremove --purge &&
    sudo apt-get clean &&

    # Removing Old Unused Linux Kernels
    IN_USE=$(uname -a | awk '{ print $3 }')
echo -e "${GREEN}Your in use kernel is ${IN_USE} ${NC}"
OLD_KERNELS=$(
    dpkg --list |
        grep -v "$IN_USE" |
        grep -Ei 'linux-image|linux-headers|linux-modules' |
        awk '{ print $2 }'
)
# skipcq: SH-2154
if [ "${#files[@]}" -ne "0" ]; then
    echo -e "\n${GREEN}Old Kernels to be removed:${NC}"
    echo -e "${GREEN}$OLD_KERNELS${NC}\n"
    read -r -p "${RED}Do you want to delete the old kernels? [y/N]${NC} " response
    case "$response" in
    [yY][eE][sS] | [yY])
        for PACKAGE in $OLD_KERNELS; do
            yes | apt purge "$PACKAGE"
        done
        ;;
    *)
        echo -e "${RED}Skipping Removing old kernel...${NC}"
        ;;
    esac
else
    echo -e "${GREEN}No old unused kernel to clean.${NC}"
fi

# Cleaning Thumbnail Cache
echo -e "${RED}Cleaning Thumbnails...${NC}" &&
    sudo rm -rf ~/.cache/thumbnails/* &&

    # Pruning Docker Objects
    echo -e "${RED}Pruning Docker images, volumes, and networks...${NC}" &&
    docker image prune -a -f --filter "until=24h" &&
    docker volume prune -f &&
    docker network prune -f

# Delete journal logs older than 5 days
sudo journalctl --vacuum-time=5days

# Summarization
END=$(df /home --output=used | grep -Eo '[0-9]+')
RECLAIMED=$((BEGIN - END))
if [ $RECLAIMED -lt 0 ]; then
    RECLAIMED=0
fi
echo "${GREEN}${RECLAIMED} KB Reclaimed. ${NC}"