Install gpiod

sudo apt update
sudo apt install gpiod

* gpiodetect - list all gpiochips present on the system, their names, labels
               and number of GPIO lines

* gpioinfo   - list all lines of specified gpiochips, their names, consumers,
               direction, active state and additional flags

* gpioget    - read values of specified GPIO lines

* gpioset    - set values of specified GPIO lines, potentially keep the lines
               exported and wait until timeout, user input or signal

* gpiofind   - find the gpiochip name and line offset given the line name

* gpiomon    - wait for events on GPIO lines, specify which events to watch,
               how many events to process before exiting or if the events
               should be reported to the console

sudo apt-get update
sudo apt-get install nvidia-jetpack

CUDA：

Terminal command line execution ：nvcc  -V，

If prompted：bash: nvcc: command not found

Then the leading environment variable:

$  export  PATH=/usr/local/cuda-11/bin:$PATH

$  export  LD_LIBRARY_PATH=/usr/local/cuda-11/lib64:$LD_LIBRARY_PATH

Then run the nvcc-V command.

cudnn：

Terminal command line execution:

$  dpkg  --list  | grep  cudnn

opencv:

Terminal command line execution:

$  dpkg  --list  | grep  libopencv

tensorRT:

Terminal command line execution:

$  pip   list   |  grep  tensorrt

network:
    version: 2
    renderer: NetworkManager
    ethernets:
        eth0:  # Network device name:
            mtu: 9000 #If this parameter is added to the mtu value, it takes effect only after the system is restarted.
            addresses: [11.22.33.44/24]  # Fill in the IP address, followed by a /24
            dhcp4: no  # Example Disable IPv4 to automatically obtain an IP address
            dhcp6: no  # Example Disable IPv6 to automatically obtain an IP address
            gateway4: 11.22.33.2  # Note The first three bits of the gateway must be the same as the first three bits of the IP address.
            nameservers:
                addresses: [22.33.44.1,22.33.44.2] # Set the IP addresses of the active and standby servers for DNS resolution. If there are multiple IP addresses, separate them with commas (,), but do not contain Spaces

echo 255 > /sys/kernel/debug/tegra_fan/target_pwm   (L4T Old version)

Or

echo 255 >/sys/devices/pwm-fan/target_pwm

Or

echo  255 > /sys/devices/platform/pwm-fan/hwmon/hwmon1/device/hwmon/hwmon1/pwm1   (Jetpack5.*)

Run command：

head -n 1 /etc/nv_tegra_release