DIFF command

I know about DIFF tools
- text mode: compare 2 files, or 2 directories
- graphical: compare 2 files, 2 directories; some tools compare 2 directory trees; some allow copying files or copying differences within the files

I often use a graphical tool to compare directory trees, but then issue Perforce commands from TCC, then TCC's SYNC command. I don't apply SYNC on the whole directory trees because they have only parts in common; I prefer however applying SYNC on subdirectories of the the directory trees as I want to copy the new files on the old files (with the graphical tools I know, I would have to choose in which direction to copy).

A DIFF command in TCC could complement SYNC, and provide a text mode directory tree comparison.