Disk Usage

$ du -d 1 | sort -n
show 1st level directories sorted by size (in kb)

$ du -d 1 | sort -k 2
show 1st level directories sorted by name

$ du --exclude=.git | sort -k 2
show size of current directory and sub-directories sorted by name, directory .git is excluded

$ du -ab --exclude=.git | sort -k 2
list all directories and files from current directory (excluding .git directory) and files from all sub-directories sorted by name and counted in bytes

du - GNU coreutils

dust is a more intuitive version of du in rust.

QDirStat is a graphical application to show where your disk space has gone and to help you to clean it up. It does not need any KDE libs or infrastructure.