What's the difference between cp and sync -n ?

[balthild]

No description provided.

[wchang22]

Let's say we have source directory A which contains file x and destination directory B which contains file y.
Let's say x and y are the exact same file.

lms cp is simply a multithreaded version of regular cp -r, where all files in A are copied over to B. This means y in B will be overwritten with the contents of x in A, even though x and y are the same file.

lms sync -n synchronizes B with A, but does not delete any files in B that are not in A, and does not copy any files that are in both A and B. This means that because x and y are the same, y will be left untouched.

[balthild]

Thanks!