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How to find disk usage information on linux

Install this simple tool ncdu for linux

sudo apt install ncdu

After this simply run the command:

sudo ncdu -x /

you will enter into navigation mode in the terminal using which you can find which directories are eating up space on your linux system.

sample output

    4,0GiB [##########] /usr
  579,3MiB [#         ] /root
  487,4MiB [#         ] /opt
   41,7MiB [          ] /lib
   22,7MiB [          ] /sbin
   21,2MiB [          ] /boot
   18,6MiB [          ] /etc
    9,1MiB [          ] /bin
    3,6MiB [          ]  core
  260,0KiB [          ] /build
   88,0KiB [          ] /tmp
e  16,0KiB [          ] /lost+found
    8,0KiB [          ] /media
    4,0KiB [          ] /lib64
e   4,0KiB [          ] /srv
e   4,0KiB [          ] /mnt
>   0,0  B [          ] /var
>   0,0  B [          ] /sys
>   0,0  B [          ] /run
>   0,0  B [          ] /proc
>   0,0  B [          ] /ovhbackup
>   0,0  B [          ] /home
>   0,0  B [          ] /dev
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