Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9647#issuecomment-156362518
Here, we are talking about modifying shell commands presented in docs, not
in `.sh` files. Your point is that the shell _does_ matter right?
The `.sh` files in Spark all require `bash` -- which is neither here nor
there in that you can invoke a `bash` script from `zsh` just fine, yes. But all
of the rest of the Spark docs likewise probably have incompatibilities with
`zsh`. It's not-unrelated to the fact that Spark internals only work with
`bash`.
This would at least need to check and fix any other incompatibilities in
the docs. At that point I wonder if it's worth the little extra friction for
most users, who will be using `bash`. I'm concerned it's indirectly setting an
expectation that all of Spark could be fine without `bash` installed.
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