A directory contains many a numbered sub－dir, and other files or directories as well. E

A directory contains many a numbered sub-dir, and other files or directories as well. Each numbered

sub-dir contains pictures(only jpg or png) and other files. Some of the pictures are original, while the

others are the result of conversion from the original(jpg.jpg or png.png or jpg.png). Write a BASH

command/script. to list all those orphaned pictures whose original counterparts are missing.

请帮忙给出正确答案和分析，谢谢！