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These days many programs like mongodb, docker etc, have there own shell i.e., if you type docker -i it opens an interactive shell (similarly with mongo and other programs).

Is there a way to automate input to these shells via Uunix shell scripts? Or any other way a Unix shell could communicate with the shells of these programs?

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docker doesn't really have it's own shell. It just executes bash inside of the container. For mongodb, use the CLI client or a library. If you have something where all other options are exhausted, as a last resort you can use expect. –  jordanm May 10 at 2:11
    
Yepp docker doesnt have its open its own shell but that of its OS in its container.. I am having a look at expect but isn't there any other way like pipe or something ? –  Mebin May 10 at 2:19

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While I am not in a position to try it the following should allow the redirection you require

$ docker -i < $(ls -lah)
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