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Full Discussion: Read input from another tty
Top Forums Shell Programming and Scripting Read input from another tty Post 302686459 by bakunin on Tuesday 14th of August 2012 03:28:19 PM
Old 08-14-2012
You haven't said which OS, etc., you are on, so you might have to adapt the following a bit:

In principle every device in Unix/Linux has a "device file", which resides in /dev. In the case of a terminal this is most probably /dev/ttyX, where "X" is some number and the device file is a character device. For instance, from my Ubuntu system:

Code:
# ls -l /dev/tty*
crw-rw-rw- 1 root tty     5,  0 Aug 14 08:35 /dev/tty
crw--w---- 1 root root    4,  0 Aug 14 08:35 /dev/tty0
crw------- 1 root root    4,  1 Aug 14 08:36 /dev/tty1
crw--w---- 1 root tty     4, 10 Aug 14 08:35 /dev/tty10
crw--w---- 1 root tty     4, 11 Aug 14 08:35 /dev/tty11
[...etc. ...]

Reading from such a device will give you whatever a user sitting at this terminal types, writing to such a device will produce the output at that screen. So, after making sure you are allowed to write to and read from the terminals device file you could probably direct your <stderr> output to it by

Code:
/some/process 2>/dev/ttyX

I hope this helps.

bakunin
 

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LEARN ABOUT CENTOS

tty

TTY(4)							     Linux Programmer's Manual							    TTY(4)

NAME

       tty - controlling terminal

DESCRIPTION

       The  file /dev/tty is a character file with major number 5 and minor number 0, usually of mode 0666 and owner.group root.tty.  It is a syn-
       onym for the controlling terminal of a process, if any.

       In addition to the ioctl(2) requests supported by the device that tty refers to, the ioctl(2) request TIOCNOTTY is supported.

   TIOCNOTTY
       Detach the calling process from its controlling terminal.

       If the process is the session leader, then SIGHUP and SIGCONT signals are sent to the foreground process group and  all	processes  in  the
       current session lose their controlling tty.

       This ioctl(2) call works only on file descriptors connected to /dev/tty.  It is used by daemon processes when they are invoked by a user at
       a terminal.  The process attempts to open /dev/tty.  If the open succeeds, it detaches itself from the terminal by using  TIOCNOTTY,  while
       if the open fails, it is obviously not attached to a terminal and does not need to detach itself.

FILES

       /dev/tty

SEE ALSO

       chown(1), mknod(1), ioctl(2), termios(3), console(4), tty_ioctl(4), ttyS(4), agetty(8), mingetty(8)

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2003-04-07								    TTY(4)
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