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$ export A=1
$ echo $A
...
$$ exit
$ echo $A
1

$ echo $A;perl -wE'say $ENV{A};$ENV{A}=2;say$ENV{A}';echo
$A
...
};qx{echo \$A};'
1
B

BEGIN {
    $ENV{test} = "B";
    }
use My::Module; # Which initializes with $ENV{test}