Jon Wahlmann wrote:
Is there a way to get a reliable listing of the source files, do a
byte for byte comparison, and report only the ones that are
different?
Isn't that what the cmp command does?
Yeah, well, I just feel better when the copy seems to be a
perfect copy. I would actually prefer to *know* that the
copy is just as reliable as the original. And if the dates
or sizes are different, it just *feels* like they are not
reliably the same.
After doing a cp -a (or rsync or whatever), if you run "du -s" on ./orig_dir
and ./dest_dir almost always the sizes will be different for reasons like
others mentioned about the "directory" files taking less space in the
destination hierarchy. Naturally, if you instead use dd to copy entire
partitions, they'll be exactly the same. But then again, you're not dealing
at the file system level.
dd also does not do well with a source drive that has errors. The
moment it hits a bump in the road, it bails.
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