Calling UNIX Shell from WLST

Hello,
I am using wlst 10g R3 on solaris 10 and need to make a series of calls to various shell scripts. when I use the os.system call the control is not returned to the wlst script :-( Any way to be able to call a script and let it run in the background then continue with the wlst script?
Cheers,

os.system is part of jython. You may want to ask in the jython-users email list from http://sourceforge.net/mail/?group_id=12867

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