Escape Character:/R carriage return and line feed/n

The concepts "Carriage Return" and "line feed" have different origins and differences.
Before the computer appeared, there was a kind of device called teletype model 33, which can contain 10 characters per second. But there is a problem, that is, when a line breaks a line, it takes 0.2 seconds, just two characters. If a new character is passed in the 0.2 s, the character will be lost.
As a result, the developers thought of a way to solve this problem, that is, adding two end characters after each line. One is "Press ENTER", which tells the typewriter to position the print head on the left boundary; the other is "line feed", which tells the typewriter to move the paper down one line.
This is the source of "line feed" and "Carriage Return". They can also be seen in their English names.
Later, computers were invented, and these two concepts were invented on computers. At that time, memory was very expensive. Some scientists thought it would be too waste to add two characters at the end of each line. Just add one character. As a result, there were differences.
In Unix systems, the end of each line is only "<line feed>", that is, "/N". In Windows systems, the end of each line is "<press enter> <change line> ", that is, "/R/N"; in Mac, the end of each line is "<press enter> ". One direct consequence is that if a file in UNIX/MAC is opened in windows, all the text will become a line. If a file in Windows is opened in UNIX/MAC, A ^ m symbol may be added at the end of each line.