Ubuntu show disk usage by directories

• To show disk usage by folders

sudo du --max-depth=1 -x -h /

• To show total disk usage by volumes

df -h

• To sort the output by size, use | sort -h:

sudo du --max-depth=1 -x -h / | sort -h

• Sometimes, the file is deleted but disk usage is not up-to-date. Because some processes may still be using those deleted files. To show which processes are using deleted files

lsof +L1