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lang-bash
envsubstdoesn't require its argument to be one line so your last step is useless and the rest can be combined:envsubst "$(declare -xp | awk -F= '{print "$"substr($1,12)})"orenvsubst "$(awk 'BEGIN{for(e in ENVIRON)print "$"e}')"envsubst "$(awk 'BEGIN{for(e in ENVIRON)print "$"e}')"seems like a way better solution. Do you want to post it, or shall I edit my answer?