One problem with your question is that you're using the word "child". For most unix folks, child implies that you're using fork, which you're not. Fork and threads work differently. The problem could have been avoided by providing a complete script.

In reply to Re^5: passing env{} variable to child fails on linux,works on windows by thargas
in thread passing env{} variable to child fails on linux,works on windows by sdetweil

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