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shellsshenvironment-variablesechojava-home

get java_home value from servers with bash script

I'm confused. I want find JAVA_HOME value in server and type this code in bash script.

ssh username@server "echo ${JAVA_HOME}"

and try 

ssh username@server "echo $JAVA_HOME"

or 

 ssh username@server 'echo $JAVA_HOME'

and all of they not worked;

I replace "JAVA_HOME" with "PATH" and it's work; I connect with ssh to server and try "echo $JAVA_HOME " and it's work. I think the problem is "_" and I don't know how fix it. please help me

Solution

  • Your approach is not feasible.

    $JAVA_HOME will be interpreted to the variable value in localhost instead of the remote server.

    Besides, executing by ssh is not a login shell, you will not get environment variables defined in /etc/profile