Have the child output the set commands instead of executing it, and process the commands in the parent.
If the parent is a Perl script:
chomp( my @cmds = `child` );
foreach my $cmd (@cmds) {
next unless /^set\s+(\S.*?)=(.*)/i;
$ENV{$1} = $2;
}
If the parent is a batch file:
for /f "usebackq delims=" %%f in (`child`) do %%f
The child would output such as
echo set VAR=5
or
print("set VAR=5\n");
Update: Added second snippet.
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