如何获取hadoop家庭环境变量? [英] How to get the hadoop home environment variable?

问题描述

如何获取HADOOP_HOME&通过UNIX终端的JAVA_HOME环境变量?

How can I get the HADOOP_HOME & JAVA_HOME environment variable through the unix terminal ?

我知道hadoop-env.sh中将存在JAVA_HOME变量，但是如何通过终端获取?

I know JAVA_HOME variable will be there in the hadoop-env.sh but how can I get through terminal?

推荐答案

例如，您可以通过在.bashrc文件中进行设置来以全局方式进行定义，也可以在Hadoop文件夹中的本地hadoop-env.sh脚本中进行设置.如果它是全局的，则可以通过以下方式进行检查:

You can define it in global way by setting it in .bashrc file or it can be set in local hadoop-env.sh script in your Hadoop folder for example. If it is global you can check it by:

echo $HADOOP_HOME

如果它是脚本选项，则可以通过将其导入当前上下文并再次检查来验证此变量:

If it is a script option, you can verify this variable by importing it into current context and checking it again:

. /usr/hadoop/bin/hadoop-env.sh
echo $HADOOP_HOME

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