The Things' Engine – Blog

;;; init.el --- -*- lexical-binding: t -*-

"Until Emacs 24.1 (June 2012), Elisp only had dynamically scoped variables, a feature, mostly by accident, common to old lisp dialects. While dynamic scope has some selective uses, it’s widely regarded as a mistake for local variables, and virtually no other languages have adopted it." – By Chris Wellons

See the article: Some Performance Advantages of Lexical Scope

Interviewer: Suppose Lord Russell that this film were to be looked at by our descendants, like a dead sea scroll in a thousand years time. What would you think it’s worth telling that generation about the life you’ve lived and the lessons you’ve learned from it?

Russell: I should like to say two things, one intellectual and one moral.

The intellectual thing I should want to say to them, is this: When you are studying any matter, or considering any philosophy, ask yourself only what are the facts and what is the truth that the facts bear out. Never let yourself be diverted, either by what you wish to believe, or by what you think would have beneficent social effects if it were believed. But look only, and solely, at what are the facts. That is the intellectual thing that I should wish to say.

The moral thing I should wish to say to them is very simple: I should say, love is wise, hatred is foolish. In this world, which is getting more and more closely interconnected, we have to learn to tolerate each other, we have to learn to put up with the fact that some people say things that we don’t like. We can only live together in that way—and if we are to live together and not die together—we must learn a kind of charity and a kind of tolerance, which is absolutely vital to the continuation of human life on this planet.

“Nothing more difficult to carry out, nor more doubtful of success, nor more dangerous to handle, than to initiate a new order of things.” - The Prince, Machiavelli 1500s

The title is update from "The Things Engine"(物联引擎) to "Something Great" (稻盛和夫), then to "Something Good" (一点有益)

Emacs is … and more.

Mojave has a new screenshot capability you get with SHIFT-COMMAND-5. After typing SHIFT-COMMAND-5, select OPTIONS, then select "Clipboard". (save to desktop" and then the Dropbox saving funtionality.)

(use-package org-download
  :after org
  :defer nil
  :custom
  (org-download-method 'directory)
  (org-download-image-dir "images")
  (org-download-heading-lvl nil)
  (org-download-timestamp "%Y%m%d-%H%M%S_")
  (org-image-actual-width 300)
  (org-download-screenshot-method "/usr/local/bin/pngpaste %s")
  :bind
  ("C-s-y" . org-download-screenshot)
  :config
  (require 'org-download))

See the reference: https://zzamboni.org/post/how-to-insert-screenshots-in-org-documents-on-macos/

1. Create a emacs lisp script, HelloWorld.el

   (message "Hello Elisp World!")
   

2. Run a elisp script on a MacOS from the command line

   /Applications/Emacs.app/Contents/MacOS/Emacs --script HelloWorld.el
   

Most useful options for running emacs lisp as a script:

• "–no-init-file" or "-q"
• "–no-site-file"
• "–batch"
• "–load= path" or "-l path"
• "–script path"

Two more things:

1. What is site-start.el The site-start.el is a int file for site-wide running of emacs, a init file for all users fo the installed emacs. On MacOS, The path is "/Applications/Emacs.app/Contents/Resources/site-lisp".
2. How to prepare your emacs lisp scrip to run in batch mode
   • self-contained
   • load all needed libraies properly

   • set the necessary load path set in the script, such as follows:

     (add-to-list 'load-path lib_path)
     

While exploring difference, never lose sight of sameness for it is sameness that brings us together. – John Briggs

A long journey begins with the first step – Lao Tzu

The macros in Org allow you to add text or code to an Org document that will be expanded during export: the text between the 3 pairs of accolades is expanded so that readers can see it in the exported versions of the document.

It can be used to construct complex HTML or LaTeX code.

#+MACRO: color @@html:<span style="color: $1">$2</span>@@
{{{color(blue, This text is colored in blue.)}}}
{{{color(red, This other text is in red.)}}}

This text is colored in blue. This other text is in red.

• Hexagrams
  “✡” “⎈” “✽” “✲” “✱” “✻” “✼” “✽” “✾” “✿” “❀” “❁” “❂” “❃” “❄” “❅” “❆” “❇”
• Circles
  “○” “☉” “◎” “◉” “○” “◌” “◎” “●” “◦” “◯” “⚪” “⚫” “⚬” “❍” “￮” “⊙” “⊚” “⊛” “∙” “∘”
• Special Circles
  “◐” “◑” “◒” “◓” “◴” “◵” “◶” “◷” “⚆” “⚇” “⚈” “⚉” “♁” “⊖” “⊗” “⊘”
• Crosses
  “✙” “♱” “♰” “☥” “✞” “✟” “✝” “†” “✠” “✚” “✜” “✛” “✢” “✣” “✤” “✥”
• Poker Sybmols
  “♠” “♣” “♥” “♦” “♤” “♧” “♡” “♢”
• Yinyang
  “☯” “☰” “☱” “☲” “☳” “☴” “☵” “☶” “☷”
• Special Symbols
  “☀” “♼” “☼” “☾” “☽” “☣” “§” “¶” “‡” “※” “✕” “△” “◇” “▶” “◀” “◈”

1: ;; use org-bullets-mode for utf8 symbols as org bullets
2: (require 'org-bullets)
3: ;; make available "org-bullet-face" such that I can control the font size individually
4: (setq org-bullets-face-name (quote org-bullet-face))
5: (add-hook 'org-mode-hook (lambda () (org-bullets-mode 1)))
6: (setq org-bullets-bullet-list '("✙" "♱" "♰" "☥" "✞" "✟" "✝" "†" "✠" "✚" "✜" "✛" "✢" "✣" "✤" "✥"))

It is how to use Emacs Lisp as formulas in Org tables. Example 1: manipulate cells. Here is a simple table:

Now type C-c } to display the table's coordinates.

1: '(concat $1 "." $2 "@emacs.edu")

Now copy this formula, type C-c = in the bottom right field to insert a column formula2 and copy the formula here. Hitting RET will immediately insert the result in this field (Even.Yellow@emacs.edu) and add the #+TBLFM line (#+TBLFM: $3='(concat $1 "." $2 "@abc.edu")) at the bottom of the table.

Paragraphs are separated by at least one empty line. If you need to enforce a line break within a paragraph, use ‘\\’ at the end of a line.

To preserve the line breaks, indentation and blank lines in a region, but otherwise use normal formatting, you can use this construct, which can also be used to format poetry.

Great clouds overhead
Tiny black birds rise and fall
Snow covers Emacs

   —AlexSchroeder

When quoting a passage from another document, it is customary to format this as a paragraph that is indented on both the left and the right margin. You can include quotations in Org documents like this:

Everything should be made as simple as possible, but not any simpler —Albert Einstein

If you would like to center some text, do it like this:

Valign.el

This package provides visual alignment for Org and Markdown tables on GUI Emacs. It can properly align tables containing variable-pitch font, CJK characters and images. Meanwhile, the text-based alignment generated by Org mode (or Markdown mode) is left untouched.

To use this package, load it and add valign-mode to org-mode-hook or markdown-mode-hook:

1: (add-hook ’org-mode-hook #’valign-mode)

Practical tcpdump examples to lift your network troubleshooting and security testing game. Commands and tips to not only use tcpdump but master ways to know your network.

Knowing tcpdump is an essential skill that will come in handy for any system administrator, network engineer or security professional.

To simply convert one file from Markdown to Org the following command can be used:

pandoc -f markdown -t org -o newfile.org original-file.markdown

The solution was to export the VoodooPad document to a folder as text (File > Export Document > Export as Text…). Then call pandoc via the find command to convert them all in one go:

$ find . -name \*.txt -type f -exec pandoc  -f markdown -t org -o {}.org {} \;

for f in `ls *.md`; do
  pandoc -f markdown -t org -o ${f}.org ${f};
done

(defun markdown-convert-buffer-to-org ()
   "Convert the current buffer's content from markdown to orgmode format and save it with the current buffer's file name but with .org extension."
   (interactive)
   (shell-command-on-region (point-min) (point-max)
                            (format "pandoc -f markdown -t org -o %s"
                                    (concat (file-name-sans-extension (buffer-file-name)) ".org"))))

DEADLINE: <2020-05-09 Sat> SCHEDULED: <2020-05-02 Sat>

Plan to write an article to talk about "Tables in Emacs with Org-mode"

End is a new beginning – YF Lin