Christoph Hormann <chr### [at] gmxde> wrote:
> apchar wrote:
> >
> > Thank you. That worked. I dont know why they route information like the list
> > of authors to stderr.
> >
>
> Because the image goes to stdout if the output file name is '-'.
>
> >
> > Is there any way to prevent all the aforementioned messages but keep the
> > line that displays the progress of the trace:
> >   0:11:02 Rendering line 107 of 480, 44093 supersamples
>
> Just filter the text stream, for example using grep:
>
> grep -E "^[ ]*[0-9]+:[0-9]+:[0-9]+"

How do you grep stderr?  I think the following do it...

povray [options] 3>&1 1>&2 2>&3 | grep -E "^[ ]*[0-9]+:[0-9]+:[0-9]+" 2>
stdout-data
(assuming you still want to preserve the image sent out via stdout, which
will be saved in "stdout-data" )
povray [options] 2>&1 | grep -E "^[ ]*[0-9]+:[0-9]+:[0-9]+"
(alternate: heck with stdout; it shouldn't contain anything)

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