[adding bug-diffutils, as requested by diff --help] On 09/03/2014 04:17 AM, Navin Kabra wrote: > Consider this: > > echo -n a > /tmp/a > echo -n b > /tmp/b > diff -B /tmp/a /tmp/b 'echo -n' is non-portable. Please get used to using 'printf' instead. > > Clearly, the two files are different, yet, diff seems to think that the > files are identical. I've managed to reproduce this problem on Ubuntu > 14.04 with diffutils 3.3, on CloudLinux 5.10 with diffutils 2.8.1, and > also Ubuntu 10.04 with diffutils 2.8.1. > > If I don't use the -B option, the problem goes away. If the files do end > with a newline, the problem goes away. If the files contain more than 1 > character, the problem goes away. If combined with *some* of the other > options (e.g. -e or -y) the problem goes away. Actually, I couldn't reproduce -y making the problem go away: $ ./src/diff -By <(printf a) <(printf b) a b $ echo $? 0 Thanks for the extensive analysis; I can confirm that this bug is still present in the latest diffutils.git sources, although I have not personally hunted for the culprit line of code yet. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature
--- End Message ---
