> On 7 Jul 2023, at 18:43, home user <[email protected]> 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 > _______________________________________________ > users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/[email protected] > Do not reply to spam, report it: > https://pagure.io/fedora-infrastructure/new_issue _______________________________________________ users mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected] Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
