Github user kevdoran commented on a diff in the pull request:
https://github.com/apache/nifi-minifi/pull/130#discussion_r197971051
--- Diff: minifi-docker/dockerhub/Dockerfile ---
@@ -34,6 +34,8 @@ RUN mkdir -p $MINIFI_HOME
RUN apk --no-cache add curl
+ADD sh/ ${MINIFI_BASE_DIR}/scripts/
--- End diff --
Either format is valid, and in this case, equivalent.
From the [POSIX
spec](http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_02):
> The simplest form for parameter expansion is:
>
> ${parameter}
>
> The value, if any, of parameter shall be substituted.
>
> The parameter name or symbol can be enclosed in braces, which are
optional... If the parameter is not enclosed in braces, and is a name, the
expansion shall use the longest valid name
---
