在Windows中，可以这样做:

In Windows, this will do it:

(for /f "delims=" %L in (oldfile.txt) do @echo predefined text %L)> newfile.txt

请注意，在批处理文件中，您需要使用双%符号:

Note that in a batch file you'll need to use double % signs:

(for /f "delims=" %%L in (oldfile.txt) do @echo predefined text %%L)> newfile.txt

还请注意，如果不将>"放在％L之后，则每行之后都会有一个空格.如果您使用">>"而不是>"，则将继续添加到newfile.txt上，而不是每次运行时都创建一个新文件.

Note also that if you don't put the ">" right after the %L, you will get a space after every line. If you use ">>" instead of ">" you will keep adding on to newfile.txt instead of creating a new one each time you run it.