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# list main directories and their size
sudo du -h --max-depth=1 /

# list sub-directories of a main directory
sudo du -h --max-depth=1 /var


# ncdu
sudo apt update
sudo apt install ncdu
sudo ncdu /

# list logs
sudo du -h /var/log

# clear logs
sudo truncate -s 0 /var/log/*.log
sudo journalctl --vacuum-size=100M

# clean cache
sudo apt clean

# list and clean old images and unused containers
docker system df
docker system prune -af

# clean temporary files
sudo rm -rf /tmp/*

# clean unused packages
sudo apt autoremove --purge
sudo apt clean

# find large files
sudo find / -type f -size +500M -exec ls -lh {} \;