Adding 'ncdu' tutorial

README.org

@@ -39,6 +39,10 @@ opportunity to learn about computers, files, directories and programs.
  * [[./tutorial/luakit.org][Searching and editing configuration files]]
  * [[./tutorial/pacman.org][Use package manager in Parabola GNU-linux]]
  
+** Disk space utilization and manipulation
+
+ * [[./tutorial/ncdu.org][Exploring disk space with 'ncdu']]
+
 ** File conversion
 
  * [[./tutorial/convertppt2pdf.org][Convert office files to pdf]]

tutorial/ncdu.org

@@ -0,0 +1,22 @@
+#+options: toc:nil num:nil author:nil
+
+* ncdu command
+
+
+~ncdu~ command is a great tool to check disk space usage. There are multiple
+options to do this task in GNU-linux systems.
+
+~ncdu~ is quite handy: simple, beatiful and let the users to interact with the files
+directly in the command line, to explore recursively and move between directories.
+
+Installing in Parabola GNU-linux:
+
+#+begin_src bash
+  pacman -S ncdu
+#+end_src
+
+To use, just call the program and await for the outocome:
+
+#+begin_src bash
+  ncdu
+#+end_src