Parse a .env (dotenv) file directly using BASH

parse_dotenv.bash

# Pass the env-vars to MYCOMMAND
eval $(egrep -v '^#' .env | xargs) MYCOMMAND
# … or ...
# Export the vars in .env into your shell:
export $(egrep -v '^#' .env | xargs)

# set variables from .compose.env but don't override existing exported vars
eval "$(grep -v '^#' .compose.env | sed -E 's|^(.+)=(.*)$|export \1=${\1:-\2}|g' | xargs -L 1)"

# Load up .env
set -o allexport
[[ -f .env ]] && source .env
set +o allexport
# or 
set -a
[ -f .env ] && . .env
set +a