China DOS Union

I wrote a DOS batch script to sort the playback order of MP3s. Please correct it.
Usually, the playback order is the same as the copying order. Therefore, controlling the copying order of song files to a USB flash drive or MP3 player can produce the effect of playing in the specified order. The order can be the reverse order of modification time, file size, file name, or extension. The sorting method is specified in the /O parameter of dir. /O-d will give priority to copying the files with the latest modification time. For more sorting methods, refer to the content of /O in dir /?.
In this sample batch script, the default drive letter of the USB flash drive (or MP3 player) is J:. There is a d:\music folder on D:, and the song files are in d:\music. The content of the sample batch script lcopy.bat is:

rem Batch file name: lcopy.bat
rem Function: Copy files in the specified order. The order can be the reverse order of modification time, file size, file name, or extension
rem The sorting method is specified in the /O parameter of dir. /O-d will give priority to copying the files with the latest modification time
rem Typical application: Copy MP3 files to the USB flash drive in the specified order. Usually, the copying order is the playback order
rem Parameter: The default drive letter of the USB flash drive is J:. There is a d:\music folder on D:, and the MP3 files are in d:\music
@echo Copy MP3 files to the USB flash drive in the specified order.............................................
d:
cd\music
if exist (lcopy.txt) del lcopy.txt
dir /o-d /b >lcopy.txt
FOR /F "delims=;" %%i in (lcopy.txt) do copy /y "%%i" j:\music
del lcopy.txt
@echo Copy completed...............................................................................

This command can get it done:
for /f "delims=" %%a in ('dir /o-d/s/b/a-d D:\music') do copy "%%a" J:\music

The places that need to be modified:

Since using ">lcopy.txt", there is no need to use "if exist (lcopy.txt) del lcopy.txt". If you simply use "dir /o-d /b >lcopy.txt" to generate the list, the newly generated "lcopy.txt" will also be included. Change it to "dir /o-d /b *.mp3>lcopy.txt"

Thanks to moderator lxmxn and大侠 zh159.

May I ask, when executing according to the statements of moderator lxmxn, it prompts that the file is not found. Because when actually executing, there is only the file name in the "", without the path name. How should I deal with this?

It should not have this problem. Did you write it in the form of "D:\music"?

Originally posted by lxmxn at 2007-11-15 18:06:
This problem should not occur. Did you write it in the form of "D:\music"?

I copied your statement, removed /s/a-d, and used it directly. Is there a problem?

Of course there is a problem.
If you remove it, it will be like this:
for /f "delims=" %%a in ('dir /o-d/b D:\music') do copy "D:\music\%%a" J:\music

Got it, thank you, moderator lxmxn

Excuse me, how to use the copy command to copy files in random order?

(Let me interject) Have to be surprised... The above is a super-long conversation between 2007 and 2009...