tree查看/usr/local下的结构怎么输入命令

要查看Linux系统上`/usr/local`目录的结构，可以在终端中输入以下命令：

tree /usr/local

运行该命令后，`tree`将递归地列出`/usr/local`目录下的所有文件和子目录，并以树形结构显示它们。您可以通过按下空格键来展开和折叠子目录。输出也会显示每个目录下的文件和子目录数量。

相关问题

/usr/local/lib/python3.8/dist-packages/gpiozero/devices.py:288: PinFactoryFallback: Falling back from rpigpio: No module named 'RPi' warnings.warn( /usr/local/lib/python3.8/dist-packages/gpiozero/devices.py:288: PinFactoryFallback: Falling back from lgpio: No module named 'lgpio' warnings.warn( /usr/local/lib/python3.8/dist-packages/gpiozero/devices.py:288: PinFactoryFallback: Falling back from rpio: No module named 'RPIO' warnings.warn( /usr/local/lib/python3.8/dist-packages/gpiozero/devices.py:288: PinFactoryFallback: Falling back from pigpio: No module named 'pigpio' warnings.warn( /usr/local/lib/python3.8/dist-packages/gpiozero/devices.py:288: PinFactoryFallback: Falling back from native: unable to locate Pi revision in /proc/device-tree or /proc/cpuinfo warnings.warn( Traceback (most recent call last): File "fan.py", line 3, in <module> fan=OutputDevice(pin=121) File "/usr/local/lib/python3.8/dist-packages/gpiozero/devices.py", line 108, in __call__ self = super(GPIOMeta, cls).__call__(*args, **kwargs) File "/usr/local/lib/python3.8/dist-packages/gpiozero/output_devices.py", line 83, in __init__ super(OutputDevice, self).__init__(pin, pin_factory=pin_factory) File "/usr/local/lib/python3.8/dist-packages/gpiozero/mixins.py", line 85, in __init__ super(SourceMixin, self).__init__(*args, **kwargs) File "/usr/local/lib/python3.8/dist-packages/gpiozero/devices.py", line 540, in __init__ super(GPIODevice, self).__init__(**kwargs) File "/usr/local/lib/python3.8/dist-packages/gpiozero/devices.py", line 250, in __init__ Device.pin_factory = Device._default_pin_factory() File "/usr/local/lib/python3.8/dist-packages/gpiozero/devices.py", line 291, in _default_pin_factory raise BadPinFactory('Unable to load any default pin factory!') gpiozero.exc.BadPinFactory: Unable to load any default pin factory!

这个错误表示GPIOZERO无法加载任何默认的引脚工厂。这通常是因为缺少必要的依赖项或配置不正确。

根据您提供的错误信息，可能是因为缺少RPi.GPIO库或其他相关库。请尝试按照以下步骤解决问题：

1.确保已安装RPi.GPIO库。您可以使用以下命令进行安装：

pip install RPi.GPIO

2.如果您没有在树莓派上运行代码，而是在其他设备上进行开发和测试，那么GPIOZERO将无法使用RPi.GPIO库。在这种情况下，您可以尝试使用Mock Pin Factory，它可以模拟GPIO引脚的功能。在导入GPIOZERO之前，将其设置为默认引脚工厂：

from gpiozero.pins.mock import MockFactory
from gpiozero import Device

Device.pin_factory = MockFactory()

请注意，使用模拟引脚工厂时，您将无法实际控制硬件。

3.如果上述步骤都无法解决问题，您可能需要检查其他依赖项或配置。请确保您的环境中没有缺少其他必要的库，并且您的用户有足够的权限来访问GPIO引脚。

如果问题仍然存在，请提供更多详细信息，以便我能够更好地帮助您解决问题。

sudo apt-get install libx264-dev Reading package lists... Done Building dependency tree Reading state information... Done libx264-dev is already the newest version (2:0.155.2917+git0a84d98-2). 0 upgraded, 0 newly installed, 0 to remove and 172 not upgraded. lxq@ubuntu:~/ffmpeg/ffmpeg-4.4$ ./configure --arch=arm --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree --enable-shared --enable-pic --cross-prefix=arm-linux-gnueabihf- --prefix=/usr/local/arm/ffmpeg --extra-cflags="-I/usr/local/arm/include" --extra-ldflags="-L/usr/local/arm/lib" ERROR: libx264 not found

根据您提供的信息，似乎已经安装了libx264-dev，但是在运行configure命令时仍然出现了找不到libx264的错误。这可能是因为configure脚本无法找到正确的libx264库文件路径。您可以尝试添加--extra-ldflags选项并指定libx264库文件的路径，例如：

./configure --arch=arm --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree --enable-shared --enable-pic --cross-prefix=arm-linux-gnueabihf- --prefix=/usr/local/arm/ffmpeg --extra-cflags="-I/usr/local/arm/include" --extra-ldflags="-L/usr/local/arm/lib -lx264"

其中"-L"选项后面是libx264库文件所在的路径，"-lx264"指定要链接的库文件名。如果您的libx264库文件不在该路径中，请将其替换为实际路径。希望这可以帮助您解决问题。