topic Re: Strange tty behaviour in Operating System - HP-UX

Strange tty behaviour

Tony Walker — Mon, 26 Apr 2004 08:23:00 GMT

Hi All,

I have a weird problem. When I telnet into machine x I login in fine - no errors. When I rlogin, the profile develops an error which I have traced to the use of `tty` to determine the device file. When rlogged in, typing tty produces "not a tty" (which is where the profile error comes from) and when I type ps I get "ps: don't know which terminal to select".

Can anyone help?

Thanks,

Tony

Re: Strange tty behaviour

harry d brown jr — Mon, 26 Apr 2004 08:33:33 GMT

Do you have something like this in your .profile??

# Set up the terminal:
if [ "$TERM" = "" ]
then
eval ` tset -s -Q -m ':?hp' `
else
eval ` tset -s -Q `
fi
stty erase "^H" kill "^U" intr "^C" eof "^D"
stty hupcl ixon ixoff
tabs

echo
echo "Value of TERM has been set to \"$TERM\". "
export TERM

EDITOR=vi
export EDITOR

fi # if !VUE

Also, are you telnet'ing or rlogin'ing(?) from another unix box or from a M$ PC? If so, what software (terminal emulator) are you using?

live free or die
harry

Re: Strange tty behaviour

Tony Walker — Mon, 26 Apr 2004 08:51:04 GMT

Harry, this is where the error is occuring:

# Set TERM variables
#
if [ `tty` = /dev/console ]
then
if [ $LOGNAME = "root" ]
then
TERM=hp
else
TERM=wyse50
fi
WSID=no
else
TERM=vt220

I'm telnetting/rlogin from another HP machine.

Cheers

Re: Strange tty behaviour

harry d brown jr — Mon, 26 Apr 2004 10:29:17 GMT

Tony,

rlogin, then issue:

tset -r

What term type is returned?

Your script, ON the CONSOLE, will set root to termtype=hp and any other account on the console to "wyse50".

All other locations will set the TERM to vt220. Are you exporting TERM?

live free or die
harry

Re: Strange tty behaviour

Tony Walker — Mon, 26 Apr 2004 10:40:55 GMT

Harry, when I type in tset -r I get "Terminal type is vt220
Erase is Backspace
Kill is Ctrl-U"

And TERM is exported a few lines further down than the ones I've detailed above.

Re: Strange tty behaviour

harry d brown jr — Mon, 26 Apr 2004 13:43:11 GMT

login and type in:

alias

Is "ps" redefined (aliased) ??

Do an "ls -l /dev/pts", do you have any, if so then how many?

Also, try these:

# grep telnet /etc/inetd.conf
telnet stream tcp nowait root /usr/lbin/telnetd telnetd
# ls -l /usr/lbin/telnetd
-r-xr--r-- 1 bin bin 94208 Sep 16 2002 /usr/lbin/telnetd
# what /usr/lbin/telnetd
/usr/lbin/telnetd:
Copyright (c) 1983, 1986 Regents of the University of California.
Patch ID: PHNE_24829
#

Also, type in "env".

Also, are you loggin in as "root" or a "common" user??

live free or die
harry

Re: Strange tty behaviour

Bill Hassell — Mon, 26 Apr 2004 19:00:10 GMT

Your code is really unnecessary since HP-UX identifies terminals automatically with the program ttytype. Replace all your TERM= code with:

eval $(ttytype -s)

You will always have terminal problems when you set TERM= something since the script has no idea what is conected. All it takes is a user to change emulators or options on a terminal and the hardcoded TERM= will create problems. By using ttytype, the TERM value will be set automatically (as long as the terminal behaves like one of the several dozen models listed in /usr/lib/terminfo)

Re: Strange tty behaviour

Tony Walker — Tue, 27 Apr 2004 03:50:17 GMT

Thanks guys.

Alas I've come in this morning and the problem no longer exists:| Bill, I'll look into implementing the use of ttytype instead - looks like its about time some of our machines got a rewrite!

Cheers,

Tony