Re: piping escape into dosemu

[Mike McCarty <Mike.McCarty@sbcglobal.net>]

TW wrote:
> 2010/3/9 Mike McCarty <Mike.McCarty@sbcglobal.net>:
>> TW wrote:
>>> [...] I start dosemu like
>>>
>>>  dosemu -input 'thedosapp.exe\r\^['
>>>
>>> because in the readme[1] I'm told that "\^[" is the syntax for the
>>> escape key.  At least that's how I interpret the "\^x" section.
>> [...] I suspect
>> that you are typing three characters '\', '^', and '['. That
>> is not the intended action. What is intended is that you type
>> a BACKSLASH ('\'), and an ESC. The shell displays on your
>> screen two characters when you type ESC, but that is a single keystroke.
>>
> 
> O.K., I'm beginning to understand what you're talking about.  Up to
> now I didn't really use anything but bash.  At least for me, pressing
> the escape key (however often) does not display anything, but when
> trying sh and dash, I see that pressing ESC "visually" resuts in ^[.

$ set | grep SHELL
SHELL=/bin/bash
SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor

$ /bin/bash --version
GNU bash, version 2.05b.0(1)-release (i386-redhat-linux-gnu)
Copyright (C) 2002 Free Software Foundation, Inc.

Perhaps something in SHELLOPTS is different, and modifies that behavior.

> And yes, now something like
> 
>   dosemu -input 'thedosapp.exe\r\^['
> 
> indeed works, many thanks for pointing me to this!  Unfortunately, for
> some reason this only works with the -input switch, but not when
> piping, like
> 
>   echo "keystroke \^[" > dospipe

Please note that "some string" and 'some string' are NOT the same.
However, in this case, I don't see what difference it would make.

> (where ^[ is what results from pressing ESC).  It doesn't work through
> dosctrl or Ruby either.  I wonder why this is supported by the -input
> switch, but not by the keystroke command...
> 
> I may try to find out more, but I believe fixing it (i.e. making the
> string representing a piped keystroke sequence is parsed in the same
> manner that a keystroke string passed on the command line is) will be
> beyond my possibilities.

I'm not ready to throw in the towel. If we keep plugging at it,
I think we can get there.

> Thanks for your help!

What do you get when you do this:

$ echo -n "^[" | wc
       0       0       1

Do you get the " 0 0 1" output I do? If so, then we can get there.
Or try

$ echo -n '^[' | wc
       0       0       1

Mike
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