Bash命令检查Linux上是否安装了Oracle或OpenJDK java版本

Question

我需要一个bash行来检查当前安装的java版本是Oracle还是OpenJDK.

通过解析java -version命令的输出来实现单行:

java -version

java Oracle输出:

java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

java OpenJDK输出:

java version "1.7.0_91"
OpenJDK Runtime Environment (amzn-2.6.2.2.63.amzn1-x86_64 u91-b00)
OpenJDK 64-Bit Server VM (build 24.91-b01, mixed mode)

Answer 1

if [[ $(java -version 2>&1) == *"OpenJDK"* ]]; then echo ok; else echo 'not ok'; fi

Answer 2

java -version 2>&1 | grep "OpenJDK Runtime" | wc -l

如果使用Oracle JDK,则返回0;如果使用OpenJDK,则返回1

Bash条件:

if [[ $(java -version 2>&1 | grep "OpenJDK Runtime") ]]