How to set environment variables from .env file

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If your lines are valid, trusted shell but for the export command

This requires appropriate shell quoting. It’s thus appropriate if you would have a line like foo='bar baz', but not if that same line would be written foo=bar baz

set -a # automatically export all variables
source .env
set +a

If your lines are not valid shell

The below reads key/value pairs, and does not expect or honor shell quoting.

while IFS== read -r key value; do
  printf -v "$key" %s "$value" && export "$key"
done <.env

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