如何查找是否在Mac中安装了jre或jdk，以及是否未使用Shell脚本安装jre
[英]How to find if jre or jdk is installed in Mac and if not install jre using shell script
问题描述
Before I install a Java application on any client machine (Mac OSX >10.5), I would like to first see if either JDK or JRE is installed already in the machine. 
在任何客户端计算机（Mac OSX> 10.5）上安装Java应用程序之前，我想首先查看计算机中是否已安装JDK或JRE。 If JRE/JDK is not present, I want to install JRE in that machine and then proceed with the actual application installation. 如果不存在JRE / JDK，我想在该计算机上安装JRE，然后继续进行实际的应用程序安装。
Was wondering how to write a shell script to find if Java is already installed in the client machine, and conditionally proceed with rest of the installation. 想知道如何编写一个shell脚本来查找客户端计算机中是否已经安装了Java，并有条件地进行其余的安装。 Any pointers to built-in tools/ sample code will help. 指向内置工具/示例代码的任何指针都将有所帮助。
1 个解决方案
解决方案1
-1 2017-09-24 09:15:03
Try running this command from shell script, result can be used to do further application installation. 尝试从shell脚本运行此命令，结果可用于进一步安装应用程序。
if [ `java -version | grep -q "java version"` ]; then
echo "Java installed"
fi
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