gorden5566 commented on issue #3450:
URL: https://github.com/apache/rocketmq/issues/3450#issuecomment-964371793
> Will the following command fulfill your requirement, which is not used
option `-r` `JAVA_MAJOR_VERSION=$("$JAVA" -version 2>&1 | head -1 | cut -d'"'
-f2 | sed 's/^1\.//' | cut -d'.' -f1)`
I test the script for several java version, it works fine
```
result -> java version
8 -> java version "1.8.0_201"
9 -> java version "9.0.4"
10 -> java version "10" 2018-03-20
10 -> java version "10.0.1" 2018-04-17
17 -> openjdk version "17" 2021-09-14
17 -> openjdk version "17.0.1" 2021-10-19
```
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