Re: [netrexx-pipelines] Strangeness when filtering linux stty output

[Marc R. <re...@gm...>]

Hi Leslie,

a 'redirected pipe' is a program that has its stdin (or stdout/stderr) redirected.

For example 'echo dog | cat', here cat is reading its stdin from the stdout of the echo command,
The cat process is not connected to a tty, hence stty has no effect.

The pipelines 'command' stage does exactly that: a java process that runs a program with its stdin/stdout redirected.

Marc

On 7/31/23 02:05, J Leslie Turriff wrote
> 	Sorry, I don't understand.  When I run stty --all in bash (no redirection) I
> get seven lines of output on stdout; when I run it as an operand of the
> command stage I get no lines.  What is the redirected pipe you're referring
> to?
> 
> Leslie
> 
> On 2023-07-30 12:56:29 Marc Remes wrote:
>> Hi Leslie,
>>
>> because a redirected pipe is not a tty, stty has no effect (and no output).
>>
>> Marc
>>
>> On 7/29/23 09:39, J Leslie Turriff wrote:
>>> Marc,
>>> 	stty is not the same as tty; tty is a device, but stty is a tool to
>>> query or change a tty's settings.
>>>
>>> On 2023-07-28 06:35:18 Marc Remes wrote:
>>>> Hi Leslie,
>>>>
>>>> A redirected pipe is not a tty. That's why the output is empty.
>>>> try pipe 'command tty | console'
>>>> There are methods to connect a pseudo tty, but I don't think we need to
>>>> adapt njpipes to support that.
>>>>
>>>> ref: https://gamlor.info/posts-output/2021-05-29-tty-in-java/en/
>>>>
>>>> Marc
>>>>
>>>>
>>>> _______________________________________________
>>>> netrexx-pipelines mailing list
>>>> net...@li...
>>>> https://lists.sourceforge.net/lists/listinfo/netrexx-pipelines
>>>
>>> _______________________________________________
>>> netrexx-pipelines mailing list
>>> net...@li...
>>> https://lists.sourceforge.net/lists/listinfo/netrexx-pipelines
>>
>> _______________________________________________
>> netrexx-pipelines mailing list
>> net...@li...
>> https://lists.sourceforge.net/lists/listinfo/netrexx-pipelines
> 
> 
> 
> _______________________________________________
> netrexx-pipelines mailing list
> net...@li...
> https://lists.sourceforge.net/lists/listinfo/netrexx-pipelines