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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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getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. SunOS 5.10 30 Aug 2004 getusershell(3C)
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