

___x_cmd_log_timestamp(){
    local arg="${1:?Provide timestamp}"
    case "$arg" in
        on)     ___X_CMD_LOG__TIMESTAMP_FORMAT="+%H:%M:%S" ;;
        off)    ___X_CMD_LOG__TIMESTAMP_FORMAT= ;;
        *)      printf "Try customized timestamp format wit date command:\n"
                ___x_cmd_cmds date "$arg" || return 1
                ___X_CMD_LOG__TIMESTAMP_FORMAT="$arg"
    esac
}
