Two ways to turn off the warning about the existing result files in ABAQUS.

Using *.bat file in Windows can handle a batch of jobs of ABAQUS, like: "call abaqus j=jobname interactive". But if the old result files exist, "Old job file exist. Overwrite? (y/n):" should be asked first, which can not be done by the *.bat file automatically. The following two ways can be introduced to solve the above problems.

1. name the different jobnames, as
   abaqus j=run1 input=case
   abaqus j=run2 input=case...
   
2. Add the following line to your Abaqus_v6.env file:
   ask_delete=OFF