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You mean write one completely from scratch? I can't imagine why you would want to...there are many other shells beyond Bash if you are looking for a feature that Bash doesn't have.
But if you did want to write your own, the best thing to do would be to start studying the source code of existing shells and learning how things are done. You can then build on top of that or modify it to do whatever it is you want in the first place. It is open source, after all.