Hi RMG,
Here you go with it:
Use Developer to generate a java application that will invoke your service from the command line and then code your script to do so.
In Developer, go to Tools->Generate Code->For calling this service from a client->Java.
And in shell script you follow below one:
#!bin/sh
path/to/java test
where test is the name of java class.
Please try to implement and let us know if any hinderances.
Thanks,
#Integration-Server-and-ESB#webMethods