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The command to run inside the container is `/etc`. The semicolon is a statement terminator, which ends the command `docker run busybox /etc`, while `echo $?` prints the exit code of that full docker command. Having this mistake could confuse someone who thinks that `/etc; echo $?` is all run inside the container, which wouldn't help the reader understand the exit code of the `docker run` command itself. Signed-off-by: Noah Silas <noah@hustle.com>