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what is the role of "bash -s"?

beer9 asked
Last Modified: 2015-05-15
I see following line to install chefdk

curl -L https://chef.io/chef/install.sh | sudo bash -s -- -P chefdk

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I want to understand that does "bash -s -- -P chefdk" does and how does '-P' gets supplied as option to 'install.sh' and not to 'bash' ?
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