MacOS Sierra - Cannot find what is using all disk space
Try sudo ncdu instead. As a normal admin or user you are not allowed to scan the content of certain folders (all indicated by an error while scanning and in the final listing by a dot - if a subfolder can't be scanned - or an exclamation mark - if the whole folder is excluded from scanning due to missing read permissions!).

Examples (only the big six and the .Spotlight-V100 folder are shown here):


ncdu:

   10,7 GiB [##########] /Applications                                                                                               
.   4,8 GiB [####      ] /System
.   3,5 GiB [###       ] /Library
.   2,2 GiB [##        ] /usr
.   1,8 GiB [#         ] /private
.   1,1 GiB [#         ] /Users
             ...
!   0,0   B [          ] /.Spotlight-V100

sudo ncdu:

.  10,7 GiB [##########] /Applications                                                                                               
    6,3 GiB [#####     ] /System
    5,2 GiB [####      ] /Library
    2,6 GiB [##        ] /private
    2,4 GiB [##        ] /usr
    1,2 GiB [#         ] /Users
             ...
  310,7 MiB [          ] /.Spotlight-V100





Another nice perl hack is this command:

sudo perl -e'%h=map{/.\s/;99**(ord$&amp;&amp;7)-$`,$_}`du -h`;die@h{sort%h}'


It will sort all folders (not just those in the current folder) depending on size similar to Grand Perspective without bricks:

 29G    .
 11G    ./Applications
7,4G    ./Applications/Xcode.app
6,3G    ./System
5,2G    ./Library
2,4G    ./usr
1,9G    ./usr/local
966M    ./Users/user/Library
879M    ./System/Library/PrivateFrameworks
851M    ./Applications/MAMP
850M    ./private/var/db/dyld
805M    ./usr/local/mysql-5.7.11-osx10.9-x86_64/lib
778M    ./System/Library/Frameworks
...