Today I had to copy some MySQL data from Debian server into test environment on my MacBook. While importing data from tab delimited text files, I noticed warnings that data in the last column of several tables was being truncated. I looked at the tables and noticed MySQL doing some very strange formatting when printing them. It looked almost as if last column was padded with a bunch of white space. I opened import file in TextWrangler and it appeared fine, but when I looked in document options, I saw this:

• End Of File: Prototype() Mac Os X
• Mac Os File System Structure
• Mac Os X File System

With a Mac keyboard, there are two keyboard shortcuts that provide Home and End key functionality. Fn + left and right arrow keys Press the Function key and the right arrow key to jump to the. If the final character is an at sign (@), then it signifies that the file or folder has extended file attributes relating to security, giving certain apps (like Finder) persistent file access. This is related in part to new security features introduced in macOS Catalina, although file access control lists (ACLs) have been a Mac feature since. Summary: Illegal file/folder names and conventions for the following operating systems: Windows Mac OS 9 Mac OS X Description: EXPLANATION & OVERVIEW In the realm of cross-platform file sharing, sometimes the end users are not aware of the limitations posed by the operating system.

The good ol' EOL (end-of-line) character...
Different operating systems use different characters to mark the end of line:

• Unix / Linux / OS X uses LF (line feed, 'n', 0x0A)
• Macs prior to OS X use CR (carriage return, 'r', 0x0D)
• Windows / DOS uses CR+LF (carriage return followed by line feed, 'rn', 0x0D0A)

I'm guessing the person who sent me those files first transferred them to his Windows machine in ASCII mode, so newline characters got automatically converted during transfer.
Since some of the files were very big, instead of changing line endings in TextWrangler I decided to use command line (shocking, I know).
First I executed

End Of File: Prototype() Mac Os X

Mac Os File System Structure

to confirm existence of the dreaded ^M (carriage return) at the end of every line, and then ran
to generate new files without CR characters.
tr (translate character) is a nice little utility that does just that, substitutes one character with another or deletes it (like in my example). It's available on pretty much any *nix distro so no need to install additional software.

In 1984 Apple Computer unveiled their Macintosh. It included a new user interface that revolutionized the way people though about computer interaction. Originally referred to as simply 'Macintosh System', the underlying OS was a single-tasking disk system for the Motorola 68K CPU. Significant changes were made in MacOS 7.x.

Emulation note: For MacOS 0.x-6.x we recommend the vMac Mini emulator.

It is possible to write Macintosh 400k/800k images to a real disk using a Kryoflux.

Mac Os X File System

Note: Wikipedia's/Apple's Developer CD Classic Mac OS 'System Software' numbering scheme is GARBAGE and should NOT be used.

Screenshots

Release notes

Twiggy Mac OS is a development pre-release used with the 5.25' Twiggy prototype Macintosh.

This version will not run on a normal Macintosh or emulator, and used Apple's 5.25' Twiggy floppy disk. A special Twiggy Macintosh emulator is included so you may try it for yourself.

There are also two 'Sony Test' pre-releases, that run from a 3.5' disk. One includes a late version of the original Finder prototype renamed as 'Flounder'.

A detailed review can be found here: Toastytech Apple Macintosh Twiggy Pre-Release