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Full Discussion: stty: : Not a typewriter
Top Forums UNIX for Dummies Questions & Answers stty: : Not a typewriter Post 31314 by yls177 on Tuesday 5th of November 2002 09:51:16 PM
Old 11-05-2002
I assume that you actually have something sensible in place of "<oraid>".

>> yes, i have.

The stty command sends ioctl's to its stdin. You can do this:

>> ioctl.. hmmm, i did a man ioctl and after reading, my understanding is that it controls the input and ouput of a device. am i right?

stty -a > stty.out
but you cannot do this:
stty -a > stty.out < /dev/null
because /dev/null is not a tty device. Ther ioctl's will fail.

>> hmmm, does /dev/null and 2&>1 differ?

Some people put stty commands in their startup scripts (.profile for ksh). Ideally, they should test to see if the shell is interactive.

When you run "su -", you are asking for the startup scripts to run. But the su statement does not have stdin connected to a tty. So the stty in the start script fails and you get the error message.

>> so u mean that we can actually connect a tty to the command su - ?
yls177
 

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STTY(3) 						   BSD Library Functions Manual 						   STTY(3)

NAME
stty, gtty -- set and get terminal state (defunct) LIBRARY
Compatibility Library (libcompat, -lcompat) SYNOPSIS
#include <sgtty.h> stty(int fd, struct sgttyb *buf); gtty(int fd, struct sgttyb *buf); DESCRIPTION
These interfaces are obsoleted by ioctl(2). They are available from the compatibility library, libcompat. The stty() function sets the state of the terminal associated with fd. The gtty() function retrieves the state of the terminal associated with fd. To set the state of a terminal the call must have write permission. The stty() call is actually 'ioctl(fd, TIOCSETP, buf)', while the gtty() call is 'ioctl(fd, TIOCGETP, buf)'. See ioctl(2) and tty(4) for an explanation. DIAGNOSTICS
If the call is successful 0 is returned, otherwise -1 is returned and the global variable errno contains the reason for the failure. SEE ALSO
ioctl(2), tty(4) HISTORY
The stty() and gtty() functions appeared in 4.2BSD. BSD
June 4, 1993 BSD
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