Not an issue: I adapted your code for LittleFS

[lesept777]

Hi
Thanks for this great code. It's really a marvellous idea!
I wanted to make it work with LitlleFS instead of SPIFFS. I just changed all occurences of 'SPIFFS' by 'LittleFS' and it worked immediately.
I also added a command 'dump file' to print the content of a file in hexadecimal. Youo can take it and add it in your code.

My contribution is here: https://github.com/lesept777/LittleFS-Shell

[lesept777]

I also corrected a small mistake in the parsing of the commands.

If you use the command
echo Hello World file.txt
you end up with a file called World file.txt containing 'Hello'.

So I changed the parsing function to:

  void static parseCommand(const String& command, String& cmd, String& arg1, String& arg2) {
    Serial.println(command);
    int spaceIndex1 = command.indexOf(' '); // Find the index of the first space character
    int spaceIndex2 = command.lastIndexOf(' '); // Find the index of the last space character
//    int spaceIndex2 = command.indexOf(' ', spaceIndex1 + 1); // Find the index of the second space character

    if (spaceIndex1 == -1) {
      cmd = command;
    } else {
      cmd = command.substring(0, spaceIndex1); // Extract the command from the command string
      if (spaceIndex2 == -1 or spaceIndex1 == spaceIndex2) {
        arg1 = command.substring(spaceIndex1 + 1); // Extract the first argument from the command string
      } else {
        arg1 = command.substring(spaceIndex1 + 1, spaceIndex2); // Extract the first argument from the command string
        arg2 = command.substring(spaceIndex2 + 1); // Extract the second argument from the command string
      }
    }
    // Check for CR character
    if (command.indexOf('\r') != -1) {
      Serial.println("Warning: Carriage return (CR) character detected in input");
    }
  }

which seems to be working.