[BRLTTY] Appending NUL to cat
Michael Whapples
mwhapples at aim.com
Mon Sep 28 19:40:48 EDT 2009
OK, there must be something quite different about the Mac shell, it
doesn't seem to be recognising -n in the echo command (I am a bit
puzzled as I thought that was fairly standard and seems to be supported
by the shells I tried on my linux system). Anyway I think same advice,
try removing the -n option (possibly should have paid more attention to
your first post where you said someone had told you to use echo "\00" to
get the null).
Michael Whapples
On 29/09/09 00:15, james collins wrote:
> Now my synthesizer, says the line but adds a "n"?
>
> Sent from my iPhone
>
> On Sep 28, 2009, at 6:49 PM, Michael Whapples<mwhapples at aim.com> wrote:
>
>
>> Could the extra characters/text you hear be "e n"? If so it seems your
>> copy of echo is not recognising the -e option, but if speech is coming
>> out then it must be inserting the NULL. Try editing your script to
>> remove the -e option from the echo command, does it help? Having a
>> look
>> at various shells on my system it seems some versions of echo will do
>> the escape sequences needed to get the NULL character even without
>> giving the -e option.
>>
>> Michael Whapples
>> On 28/09/09 22:49, james collins wrote:
>>
>>> The script worked, but my synthesizer says something in the
>>> beginning?
>>> Like it adds, it sounds like "bn" or "vn" to what I write?
>>>
>>> Sent from my iPhone
>>>
>>> On Sep 28, 2009, at 5:08 PM, Michael Whapples<mwhapples at aim.com>
>>> wrote:
>>>
>>>
>>>
>>>> The first line should start while and end with do
>>>> second line has an echo command
>>>> Third line should just be done
>>>>
>>>> Hope that makes it clearer as to the lines.
>>>>
>>>> As for shells, you probably have bash, so you could replace sh with
>>>> bash
>>>> when launching the script or in the #!/bin/sh (so line reads #!/bin/
>>>> bash
>>>> ). I am using bash here.
>>>>
>>>> Michael Whapples
>>>> On 28/09/09 21:42, james collins wrote:
>>>>
>>>>
>>>>> On my phone which is where I am reading this email the lines you
>>>>> gave
>>>>> gotten broken up into four lines? Just wondering how to enter those
>>>>> lines:
>>>>>
>>>>> while starts the 1st line and it ends w/;
>>>>> do starts the second line
>>>>> and done is on the third line?
>>>>>
>>>>> Is that right? Also I looked at the man page for echo under bash on
>>>>> my
>>>>> computer, there is a -n option but no -e option, I wondered if that
>>>>> would make a difference? I guess I am using sh though?
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On Sep 28, 2009, at 3:26 PM, Michael Whapples<mwhapples at aim.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> You are correct that you would put at the beginning of the script
>>>>>> the line:
>>>>>> #!/bin/sh
>>>>>>
>>>>>> Also how you said to start it is correct (in fact for running it
>>>>>> in
>>>>>> the
>>>>>> way you describe that #!/bin/sh line wouldn't be needed).
>>>>>>
>>>>>> An alternative would be to set the script to be executable, a
>>>>>> command like:
>>>>>> chmod a+x your_file_name
>>>>>>
>>>>>> will set the file you name in the place of your_file_name to be
>>>>>> executable by all users. Then you can run it by simply giving the
>>>>>> file
>>>>>> name on the command line. However for this to work you MUST
>>>>>> remember
>>>>>> to
>>>>>> include that #!/bin/sh line otherwise the system won't know what
>>>>>> to
>>>>>> run
>>>>>> the script with. Also if you use this you can put the script in a
>>>>>> directory pointed at by $PATH and you can run it using just the
>>>>>> script's
>>>>>> name (eg. if you called the script file "speak_lines" and placed
>>>>>> it
>>>>>> in a
>>>>>> directory in $PATH (on my linux system /usr/local/bin would be a
>>>>>> good
>>>>>> choice) then it could be run just giving the speak_lines command).
>>>>>>
>>>>>> Now for how this script behaves:
>>>>>> Precisely how you described you wanted things to work. Launch the
>>>>>> script
>>>>>> and the cursor is placed on a new line waiting for you to enter
>>>>>> text.
>>>>>> Enter text and press enter, it will append a NULL character to the
>>>>>> text
>>>>>> and send it to /dev/cu.usbserial-FTKVMAFF and hopefully the synth
>>>>>> will
>>>>>> talk. The cursor will have dropped down a line and be waiting for
>>>>>> more
>>>>>> text, keep entering lines of text until you get bored with it, at
>>>>>> which
>>>>>> point press ctrl+d on a blank line (ends file, tells the script no
>>>>>> more
>>>>>> text to read) or ctrl+c (not so preferred as this kills it) and in
>>>>>> either case you will find yourself back at the shell prompt.
>>>>>>
>>>>>> Michael Whapples
>>>>>> On 28/09/09 20:09, james collins wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Thanks for the responses. To make a script out of the lines you
>>>>>>> gave
>>>>>>> me, would I write in a text editor, first line:
>>>>>>> #!/bin/sh
>>>>>>> How would I invoke this script, like let's say I made a script,
>>>>>>> and
>>>>>>> called it samplescript.txt, if I was in the directory where it
>>>>>>> was
>>>>>>> located I would say:
>>>>>>> sh ./samplescript.txt
>>>>>>> what would happen next? In the script cat never gets called?
>>>>>>> Would my
>>>>>>> cursor drop down a line and I would enter text? And when I hit
>>>>>>> return
>>>>>>> a NUL character would be appended to the end of the text? And
>>>>>>> then if
>>>>>>> I hit cntrl-c it would exit cat?
>>>>>>>
>>>>>>> Sent from my iPhone
>>>>>>>
>>>>>>> On Sep 28, 2009, at 1:46 PM, Michael Whapples<mwhapples at aim.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> You can do what you are asking for in three lines:
>>>>>>>>
>>>>>>>> while read myline ; do
>>>>>>>> echo -e -n "$myline\00">/dev/cu.usbserial-FTKVMAFF
>>>>>>>> done
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> On my phone it is written as four lines?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> For convenience you may want to put those three lines in a text
>>>>>>>> file
>>>>>>>> to
>>>>>>>> make a script.
>>>>>>>>
>>>>>>>> Michael Whapples
>>>>>>>> On 28/09/09 18:06, Dave Mielke wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> [quoted lines by james collins on 2009/09/28 at 12:29 -0400]
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> Just wondering what I am doing wrong? I want to use cat, but I
>>>>>>>>>> want to
>>>>>>>>>> append a NUL character to what I type? I tried typing:
>>>>>>>>>> echo -e -n '\000' | cat> /dev/cu.usbserial -FTKVMAFF
>>>>>>>>>> What I was hoping would happen, is my cursor would drop down a
>>>>>>>>>> line
>>>>>>>>>> and I would be in the cat command, I would then right some
>>>>>>>>>> text
>>>>>>>>>> and
>>>>>>>>>> when I hit return, a NUL character would be appended to the
>>>>>>>>>> text I
>>>>>>>>>> had
>>>>>>>>>> written and my synthesizer would speak the words I had
>>>>>>>>>> written?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> I think you mustn't be very familiar with Unix-style operating
>>>>>>>>> systems.
>>>>>>>>>
>>>>>>>>> When you join two commands with |, what you're doing is
>>>>>>>>> redirecting
>>>>>>>>> the input
>>>>>>>>> of the second command (in your case, cat) away from your
>>>>>>>>> keyboard
>>>>>>>>> and to the
>>>>>>>>> output of the first command (in your case, echo).
>>>>>>>>>
>>>>>>>>> There's no magic way to do what you're wanting to do. If you
>>>>>>>>> want a
>>>>>>>>> NUL
>>>>>>>>> appended to each line you type before that line is written to
>>>>>>>>> your
>>>>>>>>> synthesizer
>>>>>>>>> then you're going to have to write a simple program to do
>>>>>>>>> exactly
>>>>>>>>> that. In this
>>>>>>>>> case, a fairly simple shell script should suffice.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> This message was sent via the BRLTTY mailing list.
>>>>>>>> To post a message, send an e-mail to: BRLTTY at mielke.cc
>>>>>>>> For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> This message was sent via the BRLTTY mailing list.
>>>>>>> To post a message, send an e-mail to: BRLTTY at mielke.cc
>>>>>>> For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> _______________________________________________
>>>>>> This message was sent via the BRLTTY mailing list.
>>>>>> To post a message, send an e-mail to: BRLTTY at mielke.cc
>>>>>> For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> This message was sent via the BRLTTY mailing list.
>>>>> To post a message, send an e-mail to: BRLTTY at mielke.cc
>>>>> For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>>>>>
>>>>>
>>>>>
>>>> _______________________________________________
>>>> This message was sent via the BRLTTY mailing list.
>>>> To post a message, send an e-mail to: BRLTTY at mielke.cc
>>>> For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>>>>
>>>>
>>> _______________________________________________
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>>>
>>>
>> _______________________________________________
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>> To post a message, send an e-mail to: BRLTTY at mielke.cc
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>>
> _______________________________________________
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> To post a message, send an e-mail to: BRLTTY at mielke.cc
> For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>
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