arduino:tldr:3301a

This command is used to verify the code written in an Arduino sketch file (filename.ino).

Here is a breakdown of the command:

• "arduino" is the command-line interface (CLI) tool used to interact with the Arduino software.
• "--verify" is an option for the "arduino" CLI, indicating that we want to verify the code.
• "${filename-ino}" is a placeholder for the actual filename of the Arduino sketch file you want to verify. It is expected to have the ".ino" extension. The actual filename should be provided in place of "${filename-ino}".

When you run this command, the Arduino software will try to compile the code in the specified sketch file, checking for any syntax or compilation errors. If the code compiles successfully, you will see a message indicating that the code is "Done compiling" or similar. If there are any errors, they will be displayed in the command output, allowing you to identify and fix them.