[Gllug] file offset in running process

[Matthew King]

Alain Williams <addw at phcomp.co.uk> writes:

> I am doing a large 'dd'. I want to know how far it has got. How do I do it ?
>
> lsof does not support -o (offset) under Linux.
> Strace reports nothing useful.

>From the manpage:

       Sending a USR1 signal to a running `dd'  process  makes  it  print  I/O
       statistics to standard error and then resume copying.

              $ dd if=/dev/zero of=/dev/null& pid=$!
              $ kill -USR1 $pid; sleep 1; kill $pid

              18335302+0  records  in  18335302+0 records out 9387674624 bytes
              (9.4 GB) copied, 34.6279 seconds, 271 MB/s

This is the sort of thing that makes me think the kill command has the wrong name.

Matthew

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