There is a exception when an option is end with return key.

[naiixeel]

This problem only exists when you write your commands in shell script.

Example: program -a program -a

The first command will throw an option_syntax_exception because the command in shell script is end with return key. If the second command isn't follow with return key, it can be executed normally.

[jarro2783]

Which shell are you using? I can't reproduce this with bash.

[naiixeel]

I'm sorry for the late reply. I had test my code with shell script in Jetson TX2, which throw a exception. But when I run it in windows subsystem, it can run normally. It's weird.