What is .lis?Qusetion about the list

What is .lis?
How to create a list of cubes or images?

In ISIS, a list file is simply a text file that contains one item per line. You can build list files manually or use command line tools such as find to pipe a list of file paths into a text file. For example, if I wanted to build a list of all the cubes in my current directory, I might run find *.cub > mylist.lis