Using svn in a unix pipe

I realize that not all command line commands can be used in a unix pipe.

But it would really help me not only satisfy an itch but help in my
development process if someone here more knowledgeable in unix could give me
a hint.

What I am trying to do is take the output of ³svn st² and pipe that back
into ³svn add² or ³svn del² or...

I have so far got

svn st | egrep ³\?² | sed Œs/\?\(.*\)/ \1/¹ | svn add

So svn is outputting to egrep which is taking all the files marked ³?² and
sending that to sed to strip off the ³?² (which could be ³!² ..etc) which I
would then like to send to svn add (or delete or...).

Problem is the stdout is not making it to the add argument.

Any help would be appreciated.

Steven