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Where does BANG debugging output come from?

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John
John 2014-5-7
评论： john stanley 2016-2-9
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?
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Stephen23
Stephen23 2015-12-9
@Thomas Blazek: you should put this as an Answer. Then it can get accepted.
Thomas Blazek
Thomas Blazek 2016-2-9
编辑：Thomas Blazek 2016-2-9
Oh sorry, I totally missed this response. Will do!

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Thomas Blazek
Thomas Blazek 2016-2-9
The BANG debug mode is enabled by entering !! in the command window. It is disabled the same way, by entering !! again.
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john stanley
john stanley 2016-2-9
Thanks.
Now I have to see what other double-special-character things there are that do interesting things! I mean !!.

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