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dockerfile-sample-3/Dockerfile

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+FROM alpine
+
+# method one, shell form
+CMD sleep 10000
+
+# method two, exec form
+#CMD ["sleep", "10000"]

dockerfile-sample-4/Dockerfile

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+FROM alpine
+
+# the executable
+ENTRYPOINT ["sleep"]
+
+# the default arguments
+CMD ["10000"]

dockerfile-sample-5/Dockerfile

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+FROM alpine
+
+COPY ./docker-entrypoint.sh /
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+
+CMD ["ping", "8.8.8.8"]

dockerfile-sample-5/bad.Dockerfile

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+FROM alpine
+
+COPY ./do-stuff-then-ping.sh /
+
+CMD ["/do-stuff-then-ping.sh"]
+

dockerfile-sample-5/do-stuff-then-ping.sh

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+#!/bin/sh
+
+cat /etc/hosts
+echo "ok i'm done, now let's ping'"
+
+ping 8.8.8.8

dockerfile-sample-5/docker-entrypoint.sh

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+#!/bin/sh
+set -e
+
+cat /etc/hosts
+echo "ok i'm done, now let's ping'"
+
+exec "$@"