On 7/8/23 22:13, Samuel Sieb wrote:
On 7/8/23 13:47, Barry wrote:
On 7 Jul 2023, at 18:43, home user <mattisonw@xxxxxxxxxxx> 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.
That was mentioned in an earlier message. cmp doesn't have a recursive option and diff works just fine for binary files.
Also, if you run diff with the "-q" (--brief) option it will simply report which files differ, stopping after the first mismatch in each file, similar to what the cmp command would do.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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