remote backup with appcfg.py/bulkloader.py with script. how to handle the email/password fields?

I'm trying to write a script in python or bash which executes bulkloader.py to backup 开发者_如何学Cmy entities on appengine but I don't know how to handle the email and password prompts on the bulkloader.

is there a way to insert those fields in a bash or python script?

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Here document. Available for bash scripts and languages like Perl, PHP, Python, PowerShell and Ruby.