I have two folders.
A is an older version of B, having been copied at some point.
There may be changes in A but that are not in B.

I wanna find out if there are any, and what they are if they exist.

How do i do that, preferably using Linux standard utils

@4censord the diff util?

@16af93 @hannah these ones both recomended diff
that does technically work, but this is a 500Gb 150k files folder

so may not be that ideal to then sort through

@4censord @16af93 Ah. That indeed complicates things a little.
Though... if the directories are really big then any approach will most likely take huge amounts of time.