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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 302275553 by jlliagre on Sunday 11th of January 2009 05:27:22 AM
Old 01-11-2009
Nobody is using reals teletypes nowadays, and few people still use true terminals. In the latter case, there are usually ways to get the actual width and it is safe to default to 80 characters should it fails.

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.

One of the issues is stty output isn't specified and for example Solaris reports "columns = xx" while Linux reports "columns xx".

You should check a sample stty output with the other Unix variants you plan to support and modify my script should other discrepancies appear then you'll have a reasonably "stable" solution.
 

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LEARN ABOUT MINIX

termio

TERMIO(7)                                                    Linux Programmer's Manual                                                   TERMIO(7)

NAME

       termio - System V terminal driver interface

DESCRIPTION

       termio  is  the  name of the old System V terminal driver interface.  This interface defined a termio structure used to store terminal set-
       tings, and a range of ioctl(2) operations to get and set terminal attributes.

       The termio interface is now obsolete: POSIX.1-1990 standardized a modified version of this interface, under the name termios.  The  POSIX.1
       data  structure differs slightly from the System V version, and POSIX.1 defined a suite of functions to replace the various ioctl(2) opera-
       tions that existed in System V.  (This was done because ioctl(2) was unstandardized, and its variadic third argument does not  allow  argu-
       ment type checking.)

       If  you're  looking  for  a  page called "termio", then you can probably find most of the information that you seek in either termios(3) or
       ioctl_tty(2).

SEE ALSO

       reset(1), setterm(1), stty(1), ioctl_tty(2), termios(3), tty(4)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux                                                               2017-05-03                                                           TERMIO(7)
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