why Python os.system Module return value is be "-1"

In Python, the os.system() function returns the exit status of the executed command as its return value. An exit status of -1 typically indicates that the command failed to execute or was terminated by a signal.

Here are some possible reasons why the os.system() function might return -1:

1. Command not found: If the command passed to os.system() is not recognized by the system or does not exist in the path, the function will return -1. Make sure that the command is spelled correctly and that it exists in the system path.

2. Permission denied: If the user running the Python script does not have permission to execute the command, the function may return -1. Check the permissions on the command file and make sure that the user running the script has permission to execute it.

3. Signal termination: If the command was terminated by a signal (such as a SIGINT signal from a keyboard interrupt), the os.system() function will return -1. This typically indicates that the command was not able to complete successfully.

4. Other errors: There may be other errors that could cause the os.system() function to return -1, such as invalid arguments passed to the command or issues with the command's execution environment.

To determine the cause of the error and resolve it, you may need to check the error message returned by the command or use a different method to execute the command in Python, such as the subprocess module.