{{alias}}()
    Returns the numeric group identity of the calling process.

    The function only returns a group identity on POSIX platforms. For all other
    platforms (e.g., Windows and Android), the function returns `null`.

    Returns
    -------
    id: integer|null
        Numeric group identity.

    Examples
    --------
    > var gid = {{alias}}()

    See Also
    --------