def __virtual__():
    '''
    Only run on Linux systems
    '''
    if __grains__['kernel'] is 'Linux':
        return (False, 'The linux_sysctl execution module cannot be loaded: only available on Linux systems.')
    return __virtualname__
dataset/ETHPy150Open saltstack/salt/salt/modules/linux_sysctl.py/__virtual__/operator `!=` -> `is`