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I'm questioning whether showing a diff of files that contains "conflicts" is a standard feature of file managers. What constitutes a "conflict"? What is supposed to be shown if the files are not text files? The standard cp and mv utilities are not generic version control tools.
Don't know if "diffing" is actually a standard feature of GUI file managers, but showing a dialog comparing size and age of the files most definitely is; and I'd agree with xeruf, an interactive command line tool doing that is kind of missing, beyond what cp -i can do.
I think with the term "diff" he meant of file size, attributes and modification date, and I kinda agree with that. I use linux for ages and never thought of it. I think I will write a little script for this. If so I will post it here as answer :)
cpandmvutilities are not generic version control tools.cp -ican do.