Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/2846#issuecomment-60559452
The `awk` command here is still a little wrong, as it matches any string
`error`. `grep "\[error\]"` definitely works on `scalastyle.txt` to match
`[error]`. There's a confusion here somewhere but hey this may end up working
just fine to look for `error` only, and `awk` is probably installed everywhere,
just suboptimal.
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