linux_related

Several subdirectories exist in the root directory. Some of them are listed below.

Directory	Description
/bin	It contains the essential binary files which are necessary for booting the system and running the basic commands.
/boot	It contains the files needed for booting the system.
/dev	It contains the device files for system devices such as hard drives, printers, and input-output devices.
/etc	It contains system configuration files for various applications and services.
/home	It contains the home directories of regular users.
/lib	It contains the shared library files needed to run the programs on the system.
/mnt	It is typically used as a mount point for temporarily mounting filesystems such as external hard drives, USB drives, and network file systems.
/opt	It contains optional application software packages installed by the system administrator.
/root	It contains the home directory of the root user.
/sbin	It contains system binaries that are used for system administration tasks.
/temp	It contains temporary files created by various programs and services on the system.
/var	It contains variable data files such as log files and temporary files created by various programs and services on the system.

dialout

sudo usermod -a -G dialout ${USERNAME}

查找设备的唯一标识符：使用 udevadm 命令来查找设备的唯一标识符（如供应商 ID、产品 ID 和序列号）。
```
udevadm info --name=/dev/ttyUSB0 --attribute-walk
```
这将显示设备的所有属性。查找包含 idVendor、idProduct 和 serial 的条目。
创建 udev 规则：创建一个新的 udev 规则文件，例如 /etc/udev/rules.d/99-usb-serial.rules，并添加以下内容：
```
SUBSYSTEM=="tty", ATTRS{idVendor}=="XXXX", ATTRS{idProduct}=="YYYY", ATTRS{serial}=="ZZZZ", SYMLINK+="my_special_device"
```
将 XXXX 替换为设备的供应商 ID，将 YYYY 替换为设备的产品 ID，将 ZZZZ 替换为设备的序列号。my_special_device 是您希望为设备创建的符号链接名称。
重新加载 udev 规则：重新加载 udev 规则并触发设备：
```
sudo udevadm control --reload-rules
sudo udevadm trigger
```
在代码中使用符号链接：在代码中使用符号链接名称来访问设备，而不是使用 /dev/ttyUSBX。