open textfile from path defined by environment variable

I found this code and maybe I'm almost there. I need to get the value of the Environment variable called HOME if it exists.

These macros collect all the environemnt variabes into an array and then show them in a messabe box.

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In my workbook, I want to open a textfile from the path defined by the HOME environment variable if it exists. If the file does not exist, do not allow an error for the user. the textfile is always called ocean_def.txt

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