Join list method
The join method is used to convert a list to a string by joining each item in the list.
It takes an optional single string argument which is the deliminator between the item of the list. If omitted, a comma (“,”) will be used.
For example:
findit -d 'name: `name`, files: `files.join(", ")`' -w 'IS DIR'
will show all the directories and their files.