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docker: run and exec

The following docker run command creates a container named cont-xyz and runs a shell (/bin/sh) in it: 
$ docker run --name cont-abc --rm -i -t busybox /bin/sh
In another shell on the host, docker exec is used to run another shell in the same container: 
$ docker exec -i -t cont-abc /bin/sh
In one of these created shells, a file is created using touch: 
/ # touch /tmp/touchee
Because the other shell is in the same container, it can see the touched file: 
/ # ls -l /tmp/
total 0
-rw-r--r--    1 root     root             0 Jan 13 19:38 touchee

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