Where does BANG debugging output come from?

I just had a user show me the oddest thing. Every time he did an 'ls' in matlab.2010a, the output consisted of the directory listing but also had a number of lines that started with 'BANG' and reported things like reads from pty and bytes read.

I assume this is some kind of debug mode he accidentally activated, but I couldn't find anything in preferences that might be applicable. I can't imagine that anyone has been sneaky enough to overload 'system' to do this, and a quick search here reveals nothing.

Can anyone shed some light on this?

[Thomas Blazek]

Since I hit on this unanswered question while searching for the same problem, I want to document the resolution: The BANG debug mode is enabled by entering !! in the command window. It is disabled the same way, by entering !! again.

[Stephen23]

@Thomas Blazek: you should put this as an Answer. Then it can get accepted.

[Thomas Blazek]

Oh sorry, I totally missed this response. Will do!

Answer 1

[Thomas Blazek]

The BANG debug mode is enabled by entering !! in the command window. It is disabled the same way, by entering !! again.

[john stanley]

Thanks.

Now I have to see what other double-special-character things there are that do interesting things! I mean !!.