[R] Is there an inverse function of Sys.getenv()

[Michael]

Using "Sys.getenv()",

I got a list of 380 environment variables...

Now I open a new R session,

how do I set those environment variables in my new R session using
"Sys.setenv()"?

There is no batch function for "Sys.setenv()"?

Is there an import/export environment variables function?

Basically I want to export all the environment variables from one R
session and import them into another R session...

Thank you!