Bash function that will replace a value in a json file based off a variable matching a pattern. Useful for docker containers.

change_api_keys.sh

change_api_keys () 
{
# Change the API keys in credentials.json 
# If a variable with the value is provided
    for VAR in `env`
    do
      case "$VAR" in
          POKEMON_* )
        key_name=`echo "$VAR" | sed -e "s/^POKEMON_\(.*\)\=.*/\1/"`
        echo "Changing value of " $key_name
        key_value=`echo "$VAR" | sed -e "s/.*=\(.*\)/\1/"`
        cat credentials.json |
            jq "to_entries |
                 map(if .key == \"$key_name\"
                    then . + {\"value\":\"$key_value\"}
                    else .
                    end
                   ) |
                from_entries" > modified_credentials.json
        mv modified_credentials.json credentials.json
        ;;
        esac
    done
}