> 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 > _______________________________________________ > users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx > 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/users@xxxxxxxxxxxxxxxxxxxxxxx > Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx 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/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
