gorden5566 opened a new issue #3450:
URL: https://github.com/apache/rocketmq/issues/3450
When I start nameserver on my Mac by the `mqnamesrv` script
```
sh ./bin/mqnamesrv
```
it raise an error
```
sed: illegal option -- r
usage: sed script [-Ealn] [-i extension] [file ...]
sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file
...]
```
which lead to `JAVA_MAJOR_VERSION` always be empty, in other words, it
cannot recognize JDK gt than 1.8
The reason is that `sed` on osx has no `-r` option
We can test if the kernel is `Darwin`, and then decide how to get
`JAVA_MAJOR_VERSION` by the result
```
case "`uname`" in
Darwin)
JAVA_MAJOR_VERSION=$("$JAVA" -version 2>&1 | sed -E -n 's/.* version
"([0-9]*).*$/\1/p')
;;
*)
JAVA_MAJOR_VERSION=$("$JAVA" -version 2>&1 | sed -r -n 's/.* version
"([0-9]*).*$/\1/p')
;;
esac
```
What do you guys think?
reference #2848
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