This utility is very good for anyone who wants files on a memory card to be in alphanumeric order. A tip: instead of defining the memory card as, for example, sdb, try sdb1 ;)
Doesn't work for me. Keeps complaining "device is mounted!", then if -f option is used, still complains "permission denied!". Why is everything in linux such a major pain in the ass to get right?
Using this to sort the files & folders on my memory cards for my Spectrum Next (microSD), Gotek for Amiga (USB) and files & folders (CF) and it works brilliantly.