Hi Nittin,
In the later version, the generate_job_definition command has become part of the start_new_job (snj) command. The snj command will automatically generate necessary files before it will start running the job if the can find the settings.xml file in the root folder of the job definition. So you just need to specify the root folder of the job definition when you run the start_new_job command.
Let's say you want to name your job 'Job1' and the root folder of the job definition which contains the settings.xml is c:\houdini. Then you just need to type 'snj Job1 c:\houdini'
Hope this helps,
Cihat