I tried to `escape` dollar sign when using os.Getenv; I found that golang doesn’t do exactly what I expect (for example `$$var_one` —> print `$var_one`). Any suggestion? https://play.golang.org/p/8fXS4QfCIi , my temporary solution requires copying code from golang os pkg https://play.golang.org/p/nnsK9llwvr
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