Your favourite Linux command

I mean, the thing I like about linux can be expressed in this console session;

[~]$ ncdu
bash: ncdu: command not found...
Install package 'ncdu' to provide command 'ncdu'? [N/y] ^C
[~]$ yum info ncdu
Last metadata expiration check: 5 days, 16:29:59 ago on Thu 08 Feb 2018 15:46:56 GMT.
Available Packages
Name         : ncdu
Version      : 1.12
Release      : 5.fc27
Arch         : x86_64
Size         : 51 k
Source       : ncdu-1.12-5.fc27.src.rpm
Repo         : fedora
Summary      : Text-based disk usage viewer
URL          : http://dev.yorhel.nl/ncdu/
License      : MIT
Description  : ncdu (NCurses Disk Usage) is a curses-based version of the well-known 'du',
            : and provides a fast way to see what directories are using your disk space.

[~]$ sudo yum install ncdu
Failed to synchronize cache for repo 'Dropbox-Repository', disabling.
Last metadata expiration check: 1:41:10 ago on Wed 14 Feb 2018 06:36:05 GMT.
Dependencies resolved.
===========================================================================================
Package           Arch                Version                  Repository            Size
===========================================================================================
Installing:
ncdu              x86_64              1.13-1.fc27              updates               54 k

Transaction Summary
===========================================================================================
Install  1 Package

Total download size: 54 k
Installed size: 86 k
Is this ok [y/N]: y
Downloading Packages:
ncdu-1.13-1.fc27.x86_64.rpm                                370 kB/s |  54 kB     00:00
-------------------------------------------------------------------------------------------
Total                                                       49 kB/s |  54 kB     00:01
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                   1/1
  Installing       : ncdu-1.13-1.fc27.x86_64                                           1/1
  Running scriptlet: ncdu-1.13-1.fc27.x86_64                                           1/1
Running as unit: run-r347bb405a196451a884d5dbe5af8cf22.service
  Verifying        : ncdu-1.13-1.fc27.x86_64                                           1/1

Installed:
  ncdu.x86_64 1.13-1.fc27

Complete!

[~]$ ncdu
ncdu 1.13 ~ Use the arrow keys to navigate, press ? for help
--- /home/user/bin/ansible/roles/limepepper.wordpress ------------------------
    1.5 MiB [##########] /.kitchen
  180.0 KiB [#         ] /tests
  64.0 KiB [          ] /tasks
  52.0 KiB [          ] /templates
  32.0 KiB [          ] /path
  16.0 KiB [          ] /meta
  16.0 KiB [          ] /defaults
  16.0 KiB [          ] /vars
  16.0 KiB [          ] /handlers
  12.0 KiB [          ]  Gemfile.lock
e   8.0 KiB [          ] /files
    8.0 KiB [          ]  .kitchen.yml
    8.0 KiB [          ]  .kitchen.digitalocean.yml
    8.0 KiB [          ]  README.md
    8.0 KiB [          ]  Gemfile
    8.0 KiB [          ]  Ansiblefile_xxx
/r/linux Thread Parent