Bulk merge items sub-folders into new folder I have a main folder with about 80 folders in, each with about 10 items in. I want to be able to use a Terminal command or something to just move every item from each sub-folder into a new one (i.e the newly created folder would have around 800 items in, not separated by individual folders). Doing this by hand would be very tedious. Is there a way to do it easily and quickly? I have looked at ditto, but couldn't figure out how to use it for my use case. Any help would be much appreciated, thank you!
Assuming the structure is like

main-folder
    subfolder-1
        item-1
        item-2
    subfolder-2
        item-3
        item-4


and all the items are uniquely named, you can use

cd main-folder
mkdir ../target-folder
mv */* ../target-folder/


to move everything into a target folder on the same directory level as the main folder. If you just want to move everything into the main folder, just use

cd main-folder
mv */* .