Thanks for the replies. I'm trying to use only modules that are in the default perl distribution because my sysops won't install anything else (thanks, guys). This is the 5.8.2 distribution on my AIX host.

IPC::Run is not available in the 5.8.2 distribution.

I've made it work be reading STDIN and STDERR in separate loops. Not elegant at all but it works on Windows. I expect I'll have to make changes when it is installed on AIX.

Thanks, Bill