Actually this line just takes the .env file (that you should copy from .env.example, and modify accordingly) and uses sed and xargs to line by line (without comments) un-export the environment variables, just a convenience script, no need to use it if you don't want to :)
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Too complex with row: unset $(grep -v '^#' .env | sed -E 's/(.)=./\1/' | xargs).
It takes many my times to research bash shell script
Actually this line just takes the .env file (that you should copy from .env.example, and modify accordingly) and uses sed and xargs to line by line (without comments) un-export the environment variables, just a convenience script, no need to use it if you don't want to :)