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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 302275633 by otheus on Sunday 11th of January 2009 05:10:21 PM
Old 01-11-2009
Thanks Perderabo, fpmurphy, and notably jlliagre.

So ultimately the answer: there is none. That's fine; then the question turns, "what's the best portable way to get the number of columns for the current tty". The answer seems to be: check the COLUMNS variable, and if not available, check the "non POSIX tty wxh geometry (termios TIOCGWINSZ)" and then fall-back to 80. Does that sound right?

Concerning "non POSIX tty wxh geometry (termios TIOCGWINSZ)", how can I do this from the shell?
 

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LEARN ABOUT HPUX

cfspeed

cfspeed(3C)															       cfspeed(3C)

NAME

       cfgetospeed(), cfsetospeed(), cfgetispeed(), cfsetispeed() - tty baud rate functions

SYNOPSIS

DESCRIPTION

       These  functions set and get the input and output speed codes in the termios structure referenced by termios_p.	The termios structure con-
       tains these speed codes representing input and output baud rates as well as other terminal related parameters.  Setting the parameters on a
       terminal file does not become effective until is successfully called.

	      returns the output speed code from the
				  termios structure referenced by termios_p.

	      sets the output speed code in the
				  termios  structure  referenced by termios_p to speed.  The speed code for a baud rate of zero, is used to termi-
				  nate the connection.	If is specified, the modem control lines are no longer asserted,  which  normally  discon-
				  nects the line.

	      returns the input speed code from the
				  termios structure referenced by termios_p.

	      sets the input speed code in the
				  termios structure referenced by termios_p to speed.

RETURN VALUE

       returns the output speed code from the termios structure referenced by termios_p.

       returns the input speed code from the termios structure referenced by termios_p.

       and return zero upon successful completion.  Otherwise, they return -1 and set to indicate the error.

ERRORS

       and fail when the following condition is encountered:

	      [EINVAL]	     The value of speed is outside the range of possible speed codes as specified in

WARNINGS

       and can be used to set speed codes in the termios structure that are not supported by the terminal hardware.

SEE ALSO

       tcattribute(3C), thread_safety(5), termio(7).

STANDARDS CONFORMANCE

																       cfspeed(3C)
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