The environment variables of the shell are available through the %ENV hash in Perl. See perlvar for it.
The easiest way to make the variables available to a Perl script is to set them up beforehand:
If that is not possible, you can follow the approach outlined in Get default login environment to get the environment variables that the script sets up. Specifically, RE (tilly) 3: Get default login environment has a subroutine that does what you want.
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