Deduplicate environment variables from multiple sources with Bash 4+

dedup_env.sh

#!/bin/bash

dedup_env() {
    local -A env_ary
    while IFS== read -r key value; do
        value=$(echo "$value" | sed 's/^ *"//' | sed 's/" *$//')
        env_ary[$key]=$value
    done <<EOM
$(cat $*)
EOM
    for key in ${!env_ary[@]}; do
        echo "${key}=\"${env_ary[${key}]}\""
    done | sort
}

dedup_env <(azd env get-values) .env.state > .env.state