tar to pipe but keep verbose STDOUT separate

A normal tar command

tar cvf foo.tar ./foo >foo.out 2>foo.err

has three output IO streams

• archive data to foo.tar


• list of filenames to STDOUT (redirected into foo.out)


• error messages to STDERR (redirected into foo.err)

I can then inspect foo.err for error messages without having to read through the list of filenames.

if I want to do something with the archive data (pipe it through netcat or a special compression program) I can use tar's -f - option thus

tar cvf - ./foo 2>foo.err | squish > foo.tar.S

But now my list of filenames is mixed in with my error messages because tar's -v output obviously can't go to STDOUT (that's where the archive data flows) so tar cleverly writes that to STDERR instead.

Using Korn shell, is there a way to construct a command that pipes the archive stream to another command but still capture the -v output separately from any error messages.