Jim Meyering wrote: > Pádraig Brady <[EMAIL PROTECTED]> wrote: >> dd handles skip weirdly >> >> disk=/dev/sda8 >> dd if=$disk bs=8M count=1 skip=1000 of=/dev/null #ok >> dd if=$disk bs=8M count=1 skip=1000K of=/dev/null #reads whole disk! as seek >> fails >> >> I had a 10s look at the source and noticed a comment >> saying POSIX doesn't specify what we should do when >> skipping past the end of input. For seekable files though, >> reading the whole thing is unexpected to me at least. >> I would expect it to do: >> >> if (seekable && !seek(skip_len)) >> exit(EXIT_FAILURE); > > Thanks, but the existing behavior is deliberate, and IMHO, necessary. > > skip=N is required to try to seek, and failing that, position > the read pointer by calling read. That is so it works on > e.g., redirected stdin as well as on regular files.
redirected stdin is seekable. Note the logic I presented above. Pádraig. _______________________________________________ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
