57 using SED to process line terminators in Windows and UNIX documents

The plain text Format of UNIX and dos/windows systems is different, and dos/windows-based text files have a CR (carriage return) and LF (line break) at the end of each line, and UNIX text has only one line break.
If you want to convert a UNIX text to Windows text, you can use the following SED command line
Sed-e ' s/$/\r/' myunix.txt > Mywin.txt
In the script, the ' $ ' rule expression will match the end of the line, and ' \ R ' tells SED to insert a carriage return before it. Insert a carriage return before line break, and immediately, each line ends with CR/LF.
Although many programs do not care about the dos/windows format of the cr/lf text file, but there are several programs but care, the most famous is bash, as long as a return, it will be a problem.
If you want to convert a Windows text to a UNIX file, you can use the following SED command line:
Sed–e ' s/.$//' mywin.txt > Myunix.txt
An override rule expression matches the last character of a line, and the character happens to be a carriage return. We replace it with a null character so that it is completely removed from the output.