On 7 Jul 2023, at 18:43, home user <mattisonw(a)comcast.net>
wrote:
When I try to verify a back-up, I use "diff -r". The directory trees being
compared contain about 870 files (mostly binary, like PNG, JPG, and so on), and take up
about 707 megabytes. The trees being compared are on the hard drive and on a USB-3 stick.
When I run the "diff -r" command, it seems to finish too quickly - it seems
like less than a half of a second. I saw similar results a few weeks ago comparing about
30 gigabyte trees on the hard drive vs. on a USB-3.1 stick; the results were practically
instantaneous. Is diff actually checking every bit (or byte), or is it using some
"short cut"?
I recall that for a file is equal test cmp is the command to use not diff.
Barry
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