def command(
        commands: str or list,
        prefix: str or list = "/",
        separator: str = " ",
        case_sensitive: bool = False
    ):
        """Filter commands, i.e.: text messages starting with "/" or any other custom prefix.

        Args:
            commands (``str`` | ``list``):
                The command or list of commands as string the filter should look for.
                Examples: "start", ["start", "help", "settings"]. When a message text containing
                a command arrives, the command itself and its arguments will be stored in the *command*
                field of the :class:`Message <pyrogram.Message>`.

            prefix (``str`` | ``list``, *optional*):
                A prefix or a list of prefixes as string the filter should look for.
                Defaults to "/" (slash). Examples: ".", "!", ["/", "!", "."].
                Can be None or "" (empty string) to allow commands with no prefix at all.

            separator (``str``, *optional*):
                The command arguments separator. Defaults to " " (white space).
                Examples: /start first second, /start-first-second, /start.first.second.

            case_sensitive (``bool``, *optional*):
                Pass True if you want your command(s) to be case sensitive. Defaults to False.
                Examples: when True, command="Start" would trigger /Start but not /start.
        """

        def func(flt, message):
            text = message.text or message.caption

            if text:
                for p in flt.p:
                    if text.startswith(p):
                        s = text.split(flt.s)
                        c, a = s[0][len(p):], s[1:]
                        c = c if flt.cs else c.lower()
                        message.command = ([c] + a) if c in flt.c else None
                        break

            return bool(message.command)

        commands = commands if type(commands) is list else [commands]
        commands = {c if case_sensitive else c.lower() for c in commands}
        prefixes = set(prefix) if prefix else {""}

        return create("Command", func=func, c=commands, p=prefixes, s=separator, cs=case_sensitive)