Secure the environment variables

[Jorge Cisneros]

Hi All

  I'm new in this mail list, this is my first post, I have a question is
there any way to protect the variables on the environment file? I search on
the Internet and look like is possible to make the variables read-only or
write-one but is not working for me, maybe I doing something wrong?

My main goal is to make all variables read-only except for one. is this
possible? if, yes, is there any documentation or example?

Thanks.