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[O] How to pass shell command result to :post source-block?

From: stardiviner
Subject: [O] How to pass shell command result to :post source-block?
Date: Sat, 19 Jan 2019 11:04:30 +0800
User-agent: mu4e 1.1.0; emacs 26.1

I want to processing the shell ANSI escaping characters correctly or
just filter them out for display result correctly in Emacs.

Here is my try:

#+NAME: ansi-escape-filter
#+begin_src emacs-lisp
(ansi-color-apply-on-region (point-min) (point-max))

#+begin_src sh :dir /sudo:: :post ansi-escape-filter
sudo tree /var/spool/postfix/

#+RESULTS[<2019-01-19 10:58:39> f6d16244322abbd4fbe01bfaa084ac6bdd66a62c]:
: nil

The second source block's result is supposed to be result of command
=sudo tree /var/spool/postfix/= instead of =nil=.

Can someone help me how to do this correctly?

[ stardiviner ]
       I try to make every word tell the meaning what I want to express.

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