tag 13135 notabug
thanks
On 12/10/2012 07:58 AM, Cojocaru Alexandru wrote:
bash$ yes $(for i in $(seq 1 100000); do echo -n a; done) | dd of=big-lines
ibs=100001 count=10000
9924+76 records in
Thanks for the report. Based on this output, short reads occurred. dd
transferred exactly 10000 reads as requested, but since some of those
were short, it transferred less than 10000*100001 bytes. This is
expected (and the behavior is described in that way by POSIX); the
solution you are looking for is to _also_ use the iconv=fullblock
option, to force dd to re-read until it has a full input block rather
than immediately transferring short input reads to output.
As such, I'm closing this as not a bug. Do feel free to add further
comments to this thread, though, if you have more questions about why dd
does this.
Oh, and by the way, 'echo -n' is not portable. You want to use
printf(1) instead.