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Full Discussion: POSIX way of getting columns in tty?
Top Forums Shell Programming and Scripting POSIX way of getting columns in tty? Post 302275570 by Perderabo on Sunday 11th of January 2009 07:24:56 AM
Old 01-11-2009
Quote:
Originally Posted by jlliagre
I'm quite sure all the tty drivers available in modern Unix variants handle the non POSIX tty wxh geometry (termios TIOCGWINSZ) and the event triggered when it changes (SIGWINCH) when using a terminal emulator on a windowing system.
I hope you will agree that Solaris 10 counts as a modern Unix variant. I wanted to use the serial system console on ttya. I connected a serial cable to second Solaris 10 system. On that 2nd system, I opened a terminal window and in that window in used tip to connect. That all works fine. But when I vary the window size on the 2nd system, the first system does not seem to be informed. And no fair telling me that I manually type "stty cols 100" (or whatever) after I change my window size.

The Solaris driver used to control ttya (and ttyb) is indeed a real terminal. The other kind of terminal is a pseudo terminal. In the case of a real terminal, where a real tty driver is truely controlling a real serial port, this isn't going to work. It's true that the old printing teletypes are almost completely gone. Ditto those "ascii terminals" too. But the serial port is still alive and well. We either use another unix system as above or a laptop running putty on XP or something like that to connect to a serial port.

This isn't to say that I dislike your solution. I think your solution is as good as it gets. I am arguing that the search for an even more generic solution is futile and that there no help to be had from Posix.

And also note that jlliagre replaced awk with a grep/sed combo. Solutions involving awk are very dangerous on Solaris. Sun absolutely refuses to retire the antique version of awk so you must either use nawk or fiddle with the path on Solaris.
 

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LEARN ABOUT DEBIAN

pfspad

pfspad(1)						      General Commands Manual							 pfspad(1)

NAME

       pfspad - Add borders to a frame in PFS stream

SYNOPSIS

       pfspad  [--left	<columns>]  [--right <columns>] [--top <rows>] [--bottom <rows>] [--width <new_width>] [--height <new_height>] [--R <val>]
       [--G <val>] [--B <val>] [--Y <val>] [--help]

DESCRIPTION

       Add borders to each frame in PFS stream. User specifies size of left, right, top and bottom border or size of an  output  image.  Color	of
       borders can be specified as well.

OPTIONS

       --left <columns>, -l <columns>
	      Width in pixels of the left border.

       --right <columns>, -r <columns>
	      Width in pixels of the right border.

       --top <rows>, -t <rows>
	      Height in pixels of the top border.

       --bottom <rows>, -b <rows>
	      Height in pixels of the bottom border.

       --width <new_width>, -W <new_width>
	      Width of an output image. Note that --width can be mixed with either --left or --right option.

       --height <new_height>, -H <new_height>
	      Height of an output image. Note that --height can be mixed with either --top or --bottom option.

       --R <val>, -R <val>, --G <val>, -G <val>, --B <val>, -B <val>
	      Color of borders in RGB mode. Default color is black, and if some of the components is not specified, its value is set to 0.0.

       --Y <val>, -Y <val>
	      Color of borders in luminance mode.

       --help, -h
	      Print a list of commandline options.

EXAMPLES

       pfsin image.hdr | pfspad --left 50 --bottom 20 | pfsout out.hdr
	      Add 50 columns to the left and 20 rows to the bottom side of image.hdr.  Color of borders is default black.

       pfsin image.hdr | pfspad --top 20 --height 500 --width 400 --R 1.0 | pfsout out.hdr
	      Add 20 rows to the top side of image.hdr and create output image out.hdr 500 pixels in height and 400 pixels in width. Color of bor-
	      ders is set to red.

SEE ALSO

       pfsin(1) pfsout(1)

BUGS

       Please report bugs and comments to Dorota Zdrojewska <dzdrojewska@wi.ps.pl>.

																	 pfspad(1)
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