2022
LearnLinuxTV - Awesome Linux Tools - ncdu, Scan your Hard Disk and free up Space! 0:00 of 9:29
    https://www.youtube.com/watch?v=nj8HtCNYOsU
2021
https://www.linuxteck.com/9-basic-du-command-in-linux-with-examples/
2020
https://www.redhat.com/sysadmin/du-command-options

du
    http://www.unixmen.com/linux-basics-find-size-directory-commands/
ncdu
    http://www.unixmen.com/ncdu-ncurses-disk-usage-analyzer/
    http://dev.yorhel.nl/ncdu
    aur
        ncdu

du
  -c, --total           produce a grand total
  -d, --max-depth=N     print the total for a directory (or file, with --all)
                          only if it is N or fewer levels below the command
                          line argument;  --max-depth=0 is the same as
                          --summarize
      --files0-from=F   summarize disk usage of the
                          NUL-terminated file names specified in file F;
                          if F is -, then read names from standard input
  -h, --human-readable  print sizes in human readable format (e.g., 1K 234M 2G)
  -s, --summarize       display only a total for each argument
  -x, --one-file-system skip directories on different file systems

Samples:
du -hxcd 1 | sort --human-numeric-sort
du -hxcd 5 | grep [0-9]G | sort -rnk1,1