Hello Zopistas... I trying to modify pdf files from within zope. I use the following command: '/usr/bin/pdftk /t/in.pdf attach_files /t/a1.pdf /t/a2.pdf output /t/out.pdf' When I execute it as root it works... When executed from within zope, (this i've done via external command that executes os.system(...)) A task is started to executed it, but the task hangs. Even with set the setuid bit on /usr/bin/pdftk, making the zope spawned task run as root the command just hangs.... (I've confirmed that the task is actually running as root!) I'm sure I've forgoten something silly, but after bashing it around for several hours I just can't figure out why it hangs Any suggestions at what the problem could be are welcome 8-) Jerry P.S. Here my Control panel info, incase it's relevant.... Zope Version (unreleased version, python 2.3.4, linux2) Python Version 2.3.4 (#1, Oct 5 2004, 00:26:51) [GCC 3.3.4 (pre 3.3.5 20040809)] System Platform linux2 SOFTWARE_HOME /opt/zope/lib/python ZOPE_HOME /opt/zope INSTANCE_HOME /var/opt/zope/default CLIENT_HOME /var/opt/zope/default/var Network Services ZServer.HTTPServer.zhttp_server (Port: 8080) ZServer.FTPServer.FTPServer (Port: 8021) ZServer.HTTPServer.zhttp_server (Port: 8088) Process Id 32058 (1110281136) Running For 12 min 58 sec