Can You Produce A Script For Shuffling Music on microSD card speaker?

for a portable speaker, in a micro SD card, I need a batch file that will add random numbers to the music files after they are on the microSD card. It would first have to count the number of files present. Portable speakers only have 4 buttons which include play pause skip forward skip back. There is no shuffle mode.

Do you guys know how produce a script for this? MANY PEOPLE are asking about this online.

Thanks!

Ken