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Re: mystery

From: Roland Illig
Subject: Re: mystery
Date: Sun, 28 Mar 2021 09:41:35 +0200 (GMT+02:00)

28.03.2021 07:55:33 Andrew <website@luna-net.org>:

> Hello, I am the Andrew and learn at time with
> the source-files for hello 2.10 from packet hello-2.10.tar.gz
> https://ftp.gnu.org/gnu/hello/
> Here are coming the files with following mystery
> /hello-2.10/src/hello.c row 110, 164 with two-liner-sign 000C presents a big 
> FF with background-color

Hello Andrew,

the FF means "form feed" and is a legitimate character in C programs.

> /hello-2.10/po/boldquot.sed row 7, 8, 9, 10 with two-liner-sign 00IB presents 
> a big ESC with background-color

This character starts an "ANSI escape sequence" for colored or otherwise 
formatted output.

> /hello-2.10/po/ChangeLog row 241, 270,  with two-liner-sign 008H presents a 
> big BPH with background-color

Using a backspace is a common way to implement underlined text on a typewriter.

> Should that needed for the circumstance of functions here or is it a 
> (compression-) mistake?
>  'make' is ignoring that and the command 'file' is ignoring that
> and tells about ascii coded files but there are no such signs in ascii-table

These characters are all defined in https://unicode.org/charts/PDF/U0000.pdf 
and are also explained on https://en.m.wikipedia.org/wiki/ASCII.


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