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Regarding this tutorial "Connect a local parachain": https://docs.substrate.io/tutorials/connect-other-chains/local-parachain/, it requires
How can I do all that in command line(CLI) only?
It will be much easier and quicker for me to write a bash script to run through the whole process.
Also I need to run this whole process in a Github CICD. Please advise.
Basically, I keep in mind that everything I do from frontend is just some calls to chain. Even the actual command might get complicated depending on abstraction of what we trying to do but you just have to figure our right method.
Being specific to your use case, please see
polkadot-launch's registerParachain method: https://github.com/paritytech/polkadot-launch/blob/951af7055e2c9abfa7a03ee7848548c1a3efdc16/src/rpc.ts#L38
This will help you to bring the process atleast to nodejs which can be then accessed from Ci/Cd. To convert it to actual raw bash/sh script, you might monitor the calls made while you do the process and replicate it. But I guess this will not gonna be worth to write in bash if you can have it on nodejs.
Zombienet uses an RPC endpoint internally to issue a transaction to register the parachain using sudo iirc
Then use Zombienet to run custom Js script: https://github.com/paritytech/zombienet/blob/main/docs/src/test-dsl-definition-spec.md :
Custom js scripts: Allow to run a defined script and assert on the completeness or return value.
node-name: js-script script_relative_path [ return is comparator target_value] [within x seconds]
alice: js-script ./0008-custom.js return is greater than 1 within 200 seconds