Echo $java_home returns blank mac

Answer:

If `echo $java_home` returns blank on a Mac, it means that the `JAVA_HOME` environment variable is not set correctly or not set at all.

The `JAVA_HOME` environment variable is used to specify the location of the Java installation on your computer.

To set the `JAVA_HOME` variable on a Mac, you can follow these steps:

1. Open a terminal.
2. Use the `nano` or `vi` command to open the `~/.bash_profile` or `~/.bashrc` file. For example, you can use the following command to open the `~/.bash_profile` file:

nano ~/.bash_profile

3. Add the following line to the file:

export JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home"

Note: The path `/Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home` should be replaced with the actual path to your Java installation.

4. Save the file and exit the text editor.
5. Run the following command to apply the changes:

source ~/.bash_profile

6. Now, you can run `echo $JAVA_HOME` in the terminal, and it should display the correct Java home path.

Here is an example:

$ echo $JAVA_HOME
  /Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home

Make sure to adjust the Java home path according to your actual Java installation directory.