sets the CR/LF flag. When a file is saved from a buffer for which this flag is true, both a CR (carriage return) and a NL (new line) character are output as line terminators. This flag has no effect except when saving a file.
This flag is automatically set if you load a file that has at least one CR/LF sequence into it.
If you invoke
CRLF with no arguments, it will toggle the flag.
If you specify 0 or 1, the flag will be set to false or true,
respectively. An upper case ‘C’ will appear on the status bar if the
flag is true.