Detailed explanation of linux newline character

Carriage return and line feed character under Linux system

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Brief description

The carriage return and line feed characters are often used in reading and writing text files. It is a little more complicated under Windows, but Linux The system is simpler.

Details

Carriage return and line feed are two different concepts.

Press Enter tells the computer to position the head at the left border; line feed means to move the head down one line.

In Windows: the carriage return character is '\r', going back to the beginning of the line; the line feed character is '\n', changing to the next line at the current position;

In Unix system: I think It is not necessary to add two characters at the end of each line, so there is only a newline character at the end, that is, '\n';

In Mac system: there is only a carriage return character at the end of each line, that is, '\r'.

In other words, when Linux encounters the line feed character '\n', it will perform a carriage return and line feed operation. The carriage return character will only be displayed as the control character '^M' and no carriage return operation will occur; Windows The carriage return and line feed characters must be combined with the carriage return and line feed characters. If they are missing or in the wrong order, the line feed will not work correctly.

It should be noted that in the qt program, just write "\n". It can realize the carriage return and line feed function in Linux or Windows. When opened in a text file, Linux will only have 0x0a, windows will automatically change to 0x0d 0x0a.

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