want to tell of there are uncommitted changes

Hi,

I'm trying to wrap a standard sequence of steps in a shell script
(linux/bash) and can't seem to figure out how to tell of the execution of

svn status

returned anything. For example

~/sandbox/$svn status
? pat/foo
~/sandbox/$echo $?
0

and if I delete the foo file, then the
svn status
return nothing, but the echo $? is still 0

I want to not do some steps if there are uncommiteed changes.

Pointers greatly appreciated.

-- 
Pat Farrell
http://www.pfarrell.com/