On an external disk (that contains a clone), the /.Trashes/501/Users/myusername/Desktop folder contains (within some subfolders) a locked invisible file that I cannot delete. The whole folder starting with 'Users' is visible in the Trash in my Dock.
I have tried:
secure empty trash (it asks whether I want to delete locked files and I say yes)
empty trash via Cocktail
launched Terminal as root and went down to the file (admin user alone cannot cd into ./Trashes)
files has these properties: -rw-------@ 1 myusername myusername 4635 Mar 3 2010 int10923.ris
rm asks me whether I want to override override rw------- myusername/myusername sappnd,arch,schg,hidden for int10923.ris?
I say yes, and it answers: Operation not permitted
a get info on the file (in the Dock trash, first enabling viewing of invisible files for the Finder) shows it as locked but unchecking the box, it immediately re-checks itself, it permissions are myusername Read & Write, everyone No Access, trying to change that immediately reverts back to its previous state
trying chflags nouchg or chflags dump on the file changes nothing (with Terminal running as root)