mhenry1384 wrote: > On WinXP, I am doing this > > nant.exe | python MyFilter.py > > This command always returns 0 (success) because MyFilter.py always > succeeds.
... > How do I set the return code from MyFilter.py based on the return of > nant.exe? Is this possible? I have googled around for an hour wihtout > success. I understand that I could have MyFilter.py call "nant.exe", > but for various reasons, that's not idea for my situation. It's probably not possible. The reason is that the left-most process in the pipe is not guaranteed to exit before the right-most process, so in general, there may not be any return code to get. If you're not too attached to cmd.exe, you might want to try a different shell that can provide a similar effect to what you requested. For example, in bash, you might set the pipefail option. $ ls nonesuch | ./return_zero.py ls: nonesuch: No such file or directory $ echo $? # Print the status of the last foreground pipe. 0 $ set -o pipefail $ ls nonesuch | ./return_zero.py ls: nonesuch: No such file or directory $ echo $? 2 -- http://mail.python.org/mailman/listinfo/python-list
