1. add option to karaf shell to let the user decide how to save data if the
   target file exists.
2. add option to karaf shell to allow user enter password either in console
   or in secure GUI.
1. add option to karaf shell to let the user decide how to save data if the
   target file exists.
2. add option to karaf shell to allow user enter password either in console
   or in secure GUI.