LF = line feed character = \n
CR = carriage return character = \r
CRLF = carraige return plus line feed = \r\n
This ^^^
Basically mac terminates text lines with \r
(0x0D)
And *nix terminates text lines with \n
(0x0A)
And DOS / windows / PC terminates text lines with \r\n
(0x0D)
(0x0A)
In *nix, there's unix2dos and dos2unix to swap between the two at least for *nix and winders. Many word processors are aware of such things so you can import / open them with a word processor, then cut and paste it into a new .txt file with the appropriate \r or \n or \r\n for your OS. Many means to an end.