Xah Talk Show 2021-12-09 Tedium and Complexity of Newline in Programing Industry

• Explain what it is. Unix/Windows convention, and Mac os classic.
• explain the ascii control characters
• show how to insert LF CR etc in emacs
• explain the problem when using here string to find/replace files.
• explain the case with PowerShell.
• probably same problem for bash, perl, php, or any language that supports here string
• show php syntax of heredoc
• the art of naming of things: heredoc (perl, php), nowdoc (php), here string (PowerShell)
• the art of naming of things. Show the PowerShell github discussion.

• ASCII Characters
• Emacs: Newline Convention
• Emacs: Convert File Line Ending
• PowerShell: Write to File
• PHP: String Syntax

• different aspects of the unprintable characters.
• the unprintable/control characters, their purpose.
• encoding of it.
• notation for them.
• notation for inputting them
• glyph represenation for related concepts ¶ ↩ ↵ ⏎ ⌤ , used on keyboard or used in a text editor.

unicode ␀ ␁ ␂ ␃ ␄ ␅ ␆ ␇ ␈ ␉ ␊ ␋ ␌ ␍ ␎ ␏ ␐ ␑ ␒ ␓ ␔ ␕ ␖ ␗ ␘ ␙ ␚ ␛ ␜ ␝ ␞ ␟ ␡

• unix tool: unix2dos dos2unix
• no builtin solution in PowerShell yet.

• why is it called carriage return? what carriage?

• QWERKYWRITER Keyboard
• Typewriters
• Fat Enter Key (ISO)
• Keyboard Shortcut Notations
• Unicode: Keyboard Symbols ⌘ ↵ ⌫

• multics, unix. began using LF, breaking convention.

• git on dealing with newline. Git: Frequently Asked Questions

• we have explained:
• ascii encoding
• unicode encoding
• control characters
• line ending conventions

• operating system that uses CR, like Mac OS classic: Commodore 8-bit machines (C64, C128), Acorn BBC, ZX Spectrum, TRS-80, Apple II series, Oberon, the classic Mac OS, MIT Lisp Machine and OS-9.

• ConvertTo-EOL cmdlet with -Unix and -Windows params #6201 ❮https://github.com/PowerShell/PowerShell/issues/6201❯

• PowerShell vs Bash

• https://en.wikipedia.org/wiki/Sway_(window_manager)

• xah_talk_show_2021-12-09.txt