Re: question: does "diff" use short cuts?

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> 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.

Barry

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