What does `--rm` do when running a docker image with data volumes? -

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while going through docker documentation on running images mounted volumes following command has --rm flag set on it. 

$ docker run --rm -it -v ~/.bash_history:/.bash_history ubuntu /bin/bash

what --rm flag do?

as in docs:

--rm=false: automatically remove container when exits (incompatible -d)

the container being run automatically removed finishes work. volumes should stay untouched.


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