Shell emacs org noweb frustration

[balanga]

I have been trying to my head round the use of emacs org noweb usage-

Emacs Org-mode “noweb” is a literate-programming feature that lets you reuse and compose source code blocks by referencing other blocks.

I tried this example, but can't make head nor tail of it

#+BEGIN_SRC sh :tangle yes :noweb yes :shebang #!/bin/sh
<<fullest-disk>>
:noweb-ref is the key mechanism in Org-mode that lets you group multiple source blocks under one name and concatenate them when a noweb reference (<<name>>) is expanded.
This is different from a simple #+NAME: (which identifies a single block). With :noweb-ref you can scatter related pieces of code throughout your document and have them automatically collected in order.
#+END_SRC

* the mount point of the fullest disk
  :PROPERTIES:
  :header-args: :noweb-ref fullest-disk
  :END:

** query all mounted disks
#+BEGIN_SRC sh
df \
#+END_SRC

** strip the header row
#+BEGIN_SRC sh
| sed '1d' \
#+END_SRC

** sort by the percent full
#+BEGIN_SRC sh
| awk '{print $5 " " $6}' | sort -n | tail -1 \
#+END_SRC

** extract the mount point
#+BEGIN_SRC sh
| awk '{print $2}'
#+END_SRC

:noweb-ref is the key mechanism in Org-mode that lets you group multiple source blocks under one name and concatenate them when a noweb reference (<<name>>) is expanded.


This is different from a simple #+NAME: (which identifies a single block). With :noweb-ref you can scatter related pieces of code throughout your document and have them automatically collected in order.

This looks like Martian to me. Does it mean anything to anyone else?