usecase:
JobA wants to pass its name (%JOB_NAME%) to JobB. Therefore in the configuration of JobA the predefined parameters textfield is used to resolve the name but does not work as expected. Instead the whole string "%JOB_NAME%" is passed instead of "JobA". Here how I configured it:

– JobA-------

• predefined parameters:
  myJobName=%JOB_NAME%

=>pass parameter on to JobB

– JobB--------

• bash command(win7)
  echo %myJobName%

=>output: echo %JOB_NAME%
%JOB_NAME%

cheers
Ignaz