Last time check, those foreign conjunctions did not work under linux. It was a long standing bug but not fixed.
On Mon, Mar 5, 2018, 5:16 PM Nick S <simic...@gmail.com> wrote: > ssh can be run without pty allocation, the remote command can just be run > under pipes, for openssh, the option is -T if I read the manual pages > correctly. The real question is whether the program you want to run > remotely needs a pty (Or the signal processing changes you can get from the > pry). Certainly most of the oldstyle tools run fine without a pty - bash, > ssh itself, grep, sed, and so forth don't need a pty. vi and such > might...but many such tools have a paper tty mode left over from the dark > ages when the TI Silent 700 was an advanced terminal. And that means no > curses, no pty needed. The rule, to me, is that if the command will run in > a pipeline where it gets its input from a pipe and the output can go to a > pipe, it probably runs without caring about a pty. > > > > In my former life I did a metric ton of using ssh to run remote commands > under program control to provide secure remote access to programs/systems > while minimizing the chance of intercept. Centralized security logging, for > example. So the real question is not about ptys and scraping full screen > programs. > > The real question is, can I get a filehandle for stdin, stdout, and stderr > and then use the appropriate file I/O primitives to send data to the remote > process and get data from the process. > > My guess is that, under the covers, 2!:2 is used to create the ssh > co-process. The raw foreign doc says it returns filehandles that are bound > to standard input, output and error. If you can't get what you want from > the library, well, most of the foreign primitives are not so hard to use > directly. > > Do remember that this sort of co-process creation is only supported on > Unix. You may not care whether your program runs under android or Windows, > but this makes it non-portable. Yes, I think it is a bad thing that > Windows does not support the native Unix process structure as a standard > optional thing. There was movement that way for a bit, but that was > abandoned, I think. It might run under cygwin. > > > > On Mar 3, 2018 08:15, "Raul Miller" <rauldmil...@gmail.com> wrote: > > You are correct. > > There is a lot of OS specific code needed for PTYs, and most everyone > has other higher priorities than working through all those issues. > > Thanks, > > -- > Raul > > On Sat, Mar 3, 2018 at 6:30 AM, Omar Passos Torres de Almeida > <omar...@gmail.com> wrote: > > Thanks! > > I know those technics, but i was thinking in something coded in pure J or > > some addon. I think not exists something like those in J. > > > > Omar > > > > > > On 03/02/2018 11:25 PM, Raul Miller wrote: > >> > >> Working with ptys is kind of tricky, you'll want a program that > >> specializes in that, like expect or maybe even something like tmux. > >> > >> https://en.wikipedia.org/wiki/Expect > >> > >> https://en.wikipedia.org/wiki/Tmux > >> > >> If you're working with tmux, for example, you can use tmux send-keys > >> to "type" things into your ssh session. > >> https://ricochen.wordpress.com/2011/11/14/tmux-techniques-by-example/ > >> looks like it has some plausible examples of this. > >> > >> I hope this helps, > >> > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
