bash script to get files from a dir and compare them with another dir

Question

假设我有一个仅包含文件的Dir1（t1.txt，t2.txt，t3.txt） ，我如何仅在bash脚本中获取文件名列表，该脚本允许我将其与Dir2中的另一个文件列表进行比较，并且在不使用rSync的情况下查找丢失的文件

Answer 1

diff -r --brief Dir1 Dir2

will tell you the differences between two directories, including when one directory contains a file that the other one doesn't. Incidentally, it will also tell you if Dir1 and Dir2 both contain a files with the same name, say t1.txt , but with different contents. It won't print files that are the same between the two directories.